Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df4c2b8a80937b0…

MALICIOUS

PDF

79.7 KB Created: 2021-05-04 22:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 006d58c4c91df492f4d12efdea923729 SHA-1: 1dbe684774cf155cd917073b96ea51b5d734e615 SHA-256: 5df4c2b8a80937b03e3de4018a6551ae2642488a3b0809908577b7a6a050a2e3
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 0.9998

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://zajinet.ru/strik?utm_term=deterministic+finite+automata+in+theory+of+computation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500668/normal_602f860d6f100.pdfIn PDF document text
    • http://zazuvivilug.iblogger.org/viguv.pdfIn PDF document text
    • http://liwuzagesasa.22web.org/odd_thomas_2014_trailer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446029/normal_603e1859ed7a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499283/normal_5ff2a267c0b21.pdfIn PDF document text
    • http://dasukegejiwav.iblogger.org/avg_antivirus_apk_onhax.pdfIn PDF document text
    • http://mekapetakosa.22web.org/dead_poets_society_book_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_600dcde0c69e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_25705624d0634b53bb179676d0b29b7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ce2308-1b81-4567-af75-9aa6281a5391/how_to_pair_motorola_comfort75_baby_monitor.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_796837ad7db4433ea1ec13674128b77e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9bc383-27c9-49bb-9116-d8b6b18f34e8/adding_and_subtracting_with_place_value_blocks_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c0d790-00fe-4f19-a09f-c2d737d819a2/winchester_ts-22-blk_26_gun_safe_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/australian_visit_visa_application_form_dubai.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/barfi_film_song_wapking.pdfIn PDF document text
    • http://xatosizukav.epizy.com/accelerated_learning_techniques_brian_tracy.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_d849ea6ed43e4b779b34471228ab3061.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/990fb3c5-298b-4e6b-946b-2d7431825560/tafosonidobegeloxej.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_38ec22f0c30c449ea94962641508aea4.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 5324 bytes
SHA-256: fde07d9248fa920e8e732947bd78fddce5beac6e91cdd554e47d253c197e7b81
font_01_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 11100 bytes
SHA-256: 3fd4cb09e30b728a86925b2a73171c2e8d84c3857cd35a36f9eba990e2918722
font_02_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 16124 bytes
SHA-256: 013349286ccfa20789894ffea84ff4057d9a2febb6d45c209589bd4fd9d0cfea

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