Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c2a4a04e9110d6…

MALICIOUS

PDF

76.0 KB Created: 2021-06-06 03:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7655cdeb0a3736c1b7612637cae47886 SHA-1: 72809f2e69f1ddb58c551ac534b06163b4e13f6e SHA-256: f1c2a4a04e9110d61bff80f092666939b677d5c3d2ad5843f3068911017750f1
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://maypoin.ru/123?utm_term=sat+fee+waiver+income+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366007/normal_603ac20fad6ff.pdfIn PDF document text
    • https://wapatawavef.weebly.com/uploads/1/3/4/7/134775304/03f8c5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4367287/normal_60b68d54daf03.pdfIn PDF document text
    • https://winalefis.weebly.com/uploads/1/3/3/9/133999417/4424775.pdfIn PDF document text
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/sodukuniz.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4423772/normal_60afff995a1f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_60262cf491e48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_600bbe4f38554.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/74ea58531487.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470553/normal_5fffcedf06ee5.pdfIn PDF document text
    • https://wigotimobegevuj.weebly.com/uploads/1/3/4/3/134312632/9888452.pdfIn PDF document text
    • https://dafizoxov.weebly.com/uploads/1/3/5/3/135309439/9558848.pdfIn PDF document text
    • https://ludodufapagita.weebly.com/uploads/1/3/4/6/134616483/c771908fd56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_602a5068cdc26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501789/normal_5fdaa908c2f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_605dcdb114cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_602afe134d43e.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 5480 bytes
SHA-256: 2f79ebf6c4e4ba1f1156e462c0c31c99ba254d61ad94be0d853c88747e8d6f0e
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 10744 bytes
SHA-256: 4196f732e3979bbb4253196243bbc2f95919f45961e474e0dde21a3590a42485
font_02_sfnt_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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