Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ef32ddf7082f40…

MALICIOUS

PDF

72.8 KB Created: 2020-11-23 08:36:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 04d899d39345396bf65559618f36307c SHA-1: a4bbd8292528a00298c2da195148c6446c0842df SHA-256: 04ef32ddf7082f40971ab2c8366e1ba2b6e8913801e00326de3c52bfee0ae444
156 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 0.9997

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 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.
  • 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://trafficel.ru/aws?utm_term=embroidery+design+software+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383929/normal_5fa70eb48b8ed.pdfIn PDF document text
    • https://givurili.weebly.com/uploads/1/3/4/6/134605008/muwamovitubor-xuxixibev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483388/normal_5fb6e9ddee253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f87229da06de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_5fb2d4d9d5d1e.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/fapaga/acids_and_bases_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/favor.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/graco_crib_assembly_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/lokogurovoxuxafadefi.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/nisoboditisuno.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/dua_for_entering_the_bathroom.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/advanced_mathematics_problems_and_solutions.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_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 5488 bytes
SHA-256: cf1f53401c88eebd1a2278dcb7dc24ec18ba0b54e9a980f2b16ec233dcd8c01b
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 10920 bytes
SHA-256: 9303a1b70159b2eaffee837c99c2a831fbde21b019bc8885088e11a5e85748e2

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