Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d76e7c1371af46…

MALICIOUS

PDF

76.5 KB Created: 2021-03-28 00:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acaf606b6b75e5abb7b467ee7185776b SHA-1: d2eb17dc94b00b01063366323280365198f73d7a SHA-256: 99d76e7c1371af460210fa7ae70aed4e775085f917b81c5a067192733635ca3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, a common tactic for SEO spam or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=general+electric+advantium+microwave+oven
    • http://mysteps.online/how_to_play_mancala_printable_instructionsibfx3.pdf
    • http://farvestnn.ru/sefonekegi0arxa.pdf
    • https://cdn-cms.f-static.net/uploads/4371524/normal_602f7f973d995.pdf
    • http://sellforce.ru/golf_is_not_a_game_of_perfect_book_reviewgfmjc.pdf
    • https://static.s123-cdn-static.com/uploads/4367944/normal_5ff2d26eba287.pdf
    • http://bestita.space/3516610362179sjn.pdf
    • https://cdn-cms.f-static.net/uploads/4410695/normal_604b180c03eda.pdf
    • https://cdn-cms.f-static.net/uploads/4451023/normal_60161e18ab8eb.pdf
    • http://lulizukudomiz.scienceontheweb.net/jezinevipuvixenitirikapo.pdf
    • http://tikovg.xyz/how_to_make_sparkling_mineral_waterfifaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_1ceed12c8b454944b3ee5c33729362e9.pdf?index=true
    • http://badamowafe.onlinewebshop.net/apex_developer_guide.pdf
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_171e984de720410b9739265fceb21084.pdf?index=true
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_9a518f81c4204b779a7488d466314baa.pdf?index=true
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_eace447be89e42e4ac5dac4b830c1c1c.pdf?index=true
    • https://s3.amazonaws.com/bufipevuril/fologopesimuvikixojes.pdf
    • https://s3.amazonaws.com/biwuwukesazef/airtel_broadband_bill_statement.pdf
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_07de62d99f954a4f9ecb722b2e12c8d5.pdf?index=true
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_de4b651de5894f98b89f238d218c8b29.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_c458dd96342c4e489424a818eb566ce4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0c.bin
4d329e3463413d4659525a556ba97834b8ba402f53211a2191961a66cb28b57f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 5092 bytes
font_01_sfnt_off0000ff58.bin
b98c59dda947caaea3a6f26f7c393f3dc7df1679d3bf612af7f08701bb0e007d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 11372 bytes

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