Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0afcba3d71cb5cb…

MALICIOUS

PDF

78.1 KB Created: 2021-02-22 23:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 42aea6ff22bd3dcdaf0396e285b680cf SHA-1: 09c147fdd0167573ff14a71724fef791669fab20 SHA-256: f0afcba3d71cb5cb7f29c1e0bc154154369326cb30f316f23dcbb6e2e9e30a52
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users to potentially harmful sites.

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://jottigo.ru/wix?keyword=mindwise+nicholas+epley+pdf PDF link annotation
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/877406.pdfIn PDF document text
    • http://stickerrus.ru/57840618209dgvme.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/XyggR8m/78394848690.pdfIn PDF document text
    • http://lavkavkusa.store/6197676667607mk4.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/iMgTe1J/46880340782.pdfIn PDF document text
    • https://cdn.sqhk.co/fazofasufiwu/f1hdhaI/9314728196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5fd885fc99adb.pdfIn PDF document text
    • http://wiinorama.space/56040990758s6wqn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450247/normal_5fd8fd6a05ac1.pdfIn PDF document text
    • http://ital-tess.space/30479079777jbtir.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/jel16hf/20344367496.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446776/normal_60048e0068d48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501995/normal_5fd061115c4aa.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/ih0idAL/93187220681.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/unit_1_review_equations_and_inequalities_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 5348 bytes
SHA-256: d6db5d13fe25e37500b275ee3af8a1e334856914ab546dbc897c5dad0c3681cc
font_01_sfnt_off00010916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 10296 bytes
SHA-256: 856692ca2e77f9075bd06f8c1c057e088ca74273646a426885bfe1621e163417

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