Malicious PDF — malware analysis report

Static analysis result for SHA-256 f991329fc429ca03…

MALICIOUS

PDF

78.9 KB Created: 2021-03-08 21:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eaf8f46fb1efbf76fd8385884335320e SHA-1: 111acc3fac15f0e0a715bf8d15e351d1f14ca20d SHA-256: f991329fc429ca0387e62bd8c19ebb6589ba30ee40a7ed792dcba6784f2bd4a9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/aws?utm_term=is+it+necessary+to+learn+c+before+c%252B%252B PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491426/normal_602724c51ad0a.pdfIn PDF document text
    • http://desokore.medianewsonline.com/how_to_prepare_for_aws_cloud_certification.pdfIn PDF document text
    • https://mikezibe.weebly.com/uploads/1/3/1/4/131453119/kowuvelazab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_601a100a2bb1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5fe6bfc3672bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450148/normal_5fe0b4021a567.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5fcb63737e645.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/4227908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505687/normal_60397ff525b37.pdfIn PDF document text
    • https://vufibelugano.weebly.com/uploads/1/3/4/1/134109356/sopifa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421036/normal_6006dacd885d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482208/normal_600b394784103.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427079/normal_5ff24aaae40a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_603d1e4c8c76a.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://s3.amazonaws.com/debiwelof/pizunegudiwasijakifu.pdfIn PDF document text
    • http://tosurok.myartsonline.com/matulobawijegudexem.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/reporter_news_live_malayalam_today.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/dragon_ball_z_xenoverse_game_apk.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/12815081303.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 4844 bytes
SHA-256: 9d981e1d133731d1c05f1e87b96449cae92773f94cf6d0c86f7a6118c6188882
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 10816 bytes
SHA-256: 170cf69fbf233b4b544810a18c0b697191e8879509bce8a88511cc78c6a4a384
font_02_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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