Malicious PDF — malware analysis report

Static analysis result for SHA-256 b473469f9990ca5e…

MALICIOUS

PDF

80.8 KB Created: 2021-03-17 19:30:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 32e5bee23bcc16e3d0d44212d24fc1c1 SHA-1: e646d680b807aff1e379e62476dfdd76a88e771c SHA-256: b473469f9990ca5eb47cf61f9f1ff6827c3149fa2fa0a5d81b5bf496f61e219e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The primary purpose appears to be directing users to a multitude of external PDF files, likely as part of a link farm or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/wix?keyword=poetry+terms+scavenger+hunt PDF link annotation
    • http://wozuxel.getenjoyment.net/wesimejibomalegugasikime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_602df9545af46.pdfIn PDF document text
    • http://ludutuzabaru.iblogger.org/33481453444.pdfIn PDF document text
    • http://fomilurap.iblogger.org/25920138130.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/used_car_inspection_checklist_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_6011111553b54.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/world_map_blank_outline.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/21838691102.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_87b2cd87c55d46ac81ec9c596a123b82.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_defdd2f349e4463cbe147ef8f86d9e68.pdf?index=trueIn PDF document text
    • http://sijuzoratimi.epizy.com/what_is_antigen_and_antibody.pdfIn PDF document text
    • http://rajamuviw.epizy.com/from_dusk_till_dawn_movie_hd.pdfIn PDF document text
    • http://gijomifede.rf.gd/bebizukap.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_fc332b7b813c46d5bab057a4988372e4.pdf?index=trueIn PDF document text
    • http://gogotefabup.rf.gd/movie_maker_freeware_download_for_windows_7.pdfIn PDF document text
    • http://padegijogul.atwebpages.com/ca_ambulance_driver_handbook.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_55d9453f9c9c48acbe5986332b050d02.pdf?index=trueIn PDF document text
    • http://sawopigemon.epizy.com/car_crash_investigation_report.pdfIn PDF document text
    • http://puligop.epizy.com/thanksgiving_printable_worksheets_for_kindergarten.pdfIn PDF document text
    • http://bajivuselome.epizy.com/temepopukivu.pdfIn PDF document text
    • http://givimuvupavu.epizy.com/amd_radeon_r5_m330_lenovo_driver.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_de38e1b20598403c8f5b40a4726384ac.pdf?index=trueIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_3bf29a2cc0964eac88e90af399d68947.pdf?index=trueIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_278f1587e318478ca07792f934f5a897.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_bd6ab01758374093b7ae9fb9c781c895.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_5ed01ce184ee4f7f92cdfb918f11cd9e.pdf?index=trueIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_55e728a260f24662a0eec123ed6dc596.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://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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011a0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11A0E 18144 bytes
SHA-256: a743a979ff04ea5af2ea87c5da72f96534b651b2b2f003721c9a42f3a8bf421e
font_00_sfnt_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 5344 bytes
SHA-256: c6b12ef6efdee4584642c32d23338bdb141d9b2509c1c995d6d9680f8f35a678
font_01_sfnt_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 10844 bytes
SHA-256: bd97dc83f0eb9251a139111298266cb3b30042757161d45757946868ca5be8b3

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