Malicious PDF — malware analysis report

Static analysis result for SHA-256 776a9e8310c51b94…

MALICIOUS

PDF

76.3 KB Created: 2021-03-02 22:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 69cba4d5e07ae5d81e67f11a6f2a74bf SHA-1: 0878e48fb71a7c54092c56068a6b85e38aac205b SHA-256: 776a9e8310c51b94d49345049840a8ed8d604489fd12192843e8128f3a8ce5f9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=solucionario+mecanica+vectorial+para+ingenieros+dinamica+hibbeler+10+edicion+pdf PDF link annotation
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/ketoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_600e9eea76317.pdfIn PDF document text
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/595c9e2.pdfIn PDF document text
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/siterabepupig.pdfIn PDF document text
    • https://jifimarug.weebly.com/uploads/1/3/5/3/135319291/luwop.pdfIn PDF document text
    • https://tunawirivam.weebly.com/uploads/1/3/1/4/131437064/dafitunalosudi.pdfIn PDF document text
    • http://islandlandscapesbb.com/25749825534i69eh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448542/normal_6011eeae9edb3.pdfIn PDF document text
    • http://getveran.site/cbse_net_july_2018_cut_off9ajoj.pdfIn PDF document text
    • https://pigebatidi.weebly.com/uploads/1/3/1/4/131482999/cdc9ac03e281d3.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/fitbit_versa_lite_smart_fitness_watch_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409627/normal_5ffca3f9b6362.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5fcd75fe210c3.pdfIn PDF document text
    • https://mekebibarefuj.weebly.com/uploads/1/3/5/3/135335096/tabemifamuxumoz.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 5948 bytes
SHA-256: bf2f5391b3f3d2b06b7c96e97644cbefba2e6806de33b582541ee163f11a45a4
font_01_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 10316 bytes
SHA-256: 368312efc68c30bede9f336b161c299ce6b7b828bdc2aad5ea946c56193fd036
font_02_sfnt_off00011c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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