Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d0290629ff57fea…

MALICIOUS

PDF

75.8 KB Created: 2021-01-04 19:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d5a403e1e3afdcb4ec3e9ae7e5c4b0ef SHA-1: b489d6cbd387c8ff2bc01d78e4187190493d01c8 SHA-256: 3d0290629ff57feaa7b3c31f743c064d7884a2101cba0591efa49612b1c3126d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 5

  • 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://trafficel.ru/aws?utm_term=application+anti+malware+android PDF link annotation
    • https://vokefuda.weebly.com/uploads/1/3/4/7/134709273/gurudopezuz.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/PicoVRW/tuzanakumupo.pdfIn PDF document text
    • https://cdn.sqhk.co/mifimafonuku/jcmjijh/jessica_gee_the_bucket_list_family_age.pdfIn PDF document text
    • https://mafukizagodixep.weebly.com/uploads/1/3/4/5/134525221/5149409.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/3d69c.pdfIn PDF document text
    • https://suzexefovewav.weebly.com/uploads/1/3/4/6/134640410/bc0af93b5.pdfIn PDF document text
    • https://fatumusuwenufok.weebly.com/uploads/1/3/4/5/134578353/377229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425238/normal_5f9875de6eca9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9d2899-a272-4c49-a0e2-1b60f306ee09/15633582215.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/english_communicative_class_9_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/bureaucracy_theory.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 5124 bytes
SHA-256: a843107d909f82f583cd04c260ef61f0aba25febf2d428d945013f42480c0704
font_01_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 11080 bytes
SHA-256: 5fb0e2bdc3418480509d3e6d834ce3b9cd93cf74f9314e29babe729250ae837d

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