Malicious PDF — malware analysis report

Static analysis result for SHA-256 b672210b00f4d388…

MALICIOUS

PDF

88.5 KB Created: 2021-04-05 17:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 66ec3f1c2d160812a9b3db05865e060f SHA-1: a97b78c682adec584274ba6464ae4724bfc287d7 SHA-256: b672210b00f4d388824c78465ee1ff8880f142d6991067f6f46668578e308960
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a domain associated with downloading an application disguised as a 'secure vpn free proxy apk'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination through a network of disposable hosts and redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://jumiwimov.ru/123?utm_term=secure+vpn+free+proxy+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375210/normal_6030442296f06.pdfIn PDF document text
    • http://899themes-demo.ru/does_utah_require_safety_inspectionspje3k.pdfIn PDF document text
    • http://cleaner-inn.club/potiwujunojuketakekaticy5rg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426080/normal_5ff8a293cee2a.pdfIn PDF document text
    • http://lg-copyright.com/callie_from_the_fosters8qj6p.pdfIn PDF document text
    • https://taxubixud.weebly.com/uploads/1/3/4/7/134760406/jigoviwoligal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413004/normal_60115a77be5d0.pdfIn PDF document text
    • https://cdn.sqhk.co/wetiniwem/ggvif23/53177709905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444098/normal_600a266fc6565.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/vatuw_nuwabaxowa_xudolekez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_603601057a237.pdfIn PDF document text
    • https://cdn.sqhk.co/guwezasov/jZibw7n/77084903330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_6012914d22325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501201/normal_600d387a37507.pdfIn PDF document text
    • https://rolobaxomudozu.weebly.com/uploads/1/3/4/8/134887904/benixapib_tivelusagu.pdfIn PDF document text
    • http://8gusevshop.space/how_to_read_chart_astrologyd4a9z.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/dibgd9d/dubamabusodefotebugif.pdfIn PDF document text
    • http://temilops.xyz/how_to_trade_todays_marketkcywh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_dcb5caeb80284240b493001e393f3331.pdf?index=trueIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_3e055cd25556462aa330e0dddfd6605e.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_8e2b8ef3e39e46aca11485167b62c92c.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_72f29ec09d7545a99a6edf6669d78aa1.pdf?index=trueIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_023f268d80164096a57c8206bebdcd5a.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 4952 bytes
SHA-256: 3496aa5fdb7233e9d3edb153c7ae5f790dc5651ca891107fe426901e76da81a4
font_01_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 11324 bytes
SHA-256: c63e79a0b28a0c35736426a9508ebede226a672fcf75700effa32713fab2c2cc
font_02_sfnt_off00012f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8F 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140
font_03_sfnt_off00014455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14455 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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