Malicious PDF — malware analysis report

Static analysis result for SHA-256 df781df5036a17b9…

MALICIOUS

PDF

108.0 KB Created: 2021-03-20 15:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fdc3134c8f8fb7352916c49f9f08c94e SHA-1: 509301d306ebc561487b778ce306d765a0922f44 SHA-256: df781df5036a17b916d1efc11553ca9cbe838db21e45feb118934bddeed92199
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/wix?keyword=retro+trampoline+game+unblocked PDF link annotation
    • http://optalpha.com/7171629095irh2y.pdfIn PDF document text
    • http://healthytrands.com/81885778877pytqi.pdfIn PDF document text
    • http://madamzero.com/furuduzapasaweg5e.pdfIn PDF document text
    • http://kisuvok.scienceontheweb.net/54363279602.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/wavelet_transform_tutorial.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/introduction_to_java_programming_11th_edition_solutions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_5a26367760104f379e1c261edd8e09ec.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_70f0ecdb750a453bb6893e477f1fd4c1.pdf?index=trueIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_9b26be9f99c644758b92a2ad882a21f0.pdf?index=trueIn PDF document text
    • http://fowimifefezujo.myartsonline.com/xerigizegozavelexoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e297007-aa69-4f29-bfa1-2a534113cf56/dirk_gentlys_holistic_detective_agency_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c65dce6-acb8-42b0-bfd5-df56ed7037e1/statics_and_dynamics_hibbeler_solutions.pdfIn PDF document text
    • http://gefutikavuza.epizy.com/taledisafovufukogap.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_b77f3664af7e475b875db2ea2ac52480.pdf?index=trueIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_b54ce106f98f4167b6463f52df01304c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e812bba-9c41-4177-8eb1-77b3d0e88690/gukisixoburosesumovalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d58bb8-2f06-49d8-aeb6-051b7edeb097/introduction_to_cell_biology.pdfIn PDF document text
    • http://magajavopisili.epizy.com/fleck_5600sxt_dealers.pdfIn PDF document text
    • http://nogekaz.epizy.com/music_artist_management_contract.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00016522.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16522 18800 bytes
SHA-256: c44100bf3d3d9cb450ddab4977f41a933d7f0bca7a4c06672d26c4c43281dcc7
font_00_sfnt_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 5432 bytes
SHA-256: b5ca929e22b00bd4ae0250043e5827844117c80a82caec187b840356a96794f8
font_01_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 5308 bytes
SHA-256: 0340f0b8c4ef743ada4c3dd4c7f8d3adc08327d7e1be8baaaa1974874aeb6a24
font_02_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 2656 bytes
SHA-256: ff8289fcab20b7b81f5dc7c47458689637225d7099c48932a46d6898d6123f6c
font_03_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 4140 bytes
SHA-256: 2a2f73c0ee504ae8509221dab9a50e72e6c400a18e3952d3eee660ba18a0c3b1
font_04_sfnt_off00011a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 2108 bytes
SHA-256: 5fc9e2cd4e7ad04544edda2023dd698132b65daf167a61e09de9fd8de66d8b52
font_05_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 6640 bytes
SHA-256: 593a452f0795506ac97007ad32b21767cc543cb1bc716fd74108abb5279d52e6
font_06_sfnt_off000135c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C3 16356 bytes
SHA-256: 09e56f953b146b2960fca7aa381a04b09a113a0bc4216ddbb1bce1d9e5c2f28e
font_08_sfnt_off0001842b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1842B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_09_sfnt_off0001922d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1922D 2832 bytes
SHA-256: d7a1248cabf161ff78a072bd924b98f1b4e551660f4e151c9433689786990c0c

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