Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51898d416836686…

MALICIOUS

PDF

81.7 KB Created: 2021-03-14 00:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dcd583e1005ce3d2a5e4b598cca3193e SHA-1: e9ef7265ccb98c138dac559c95798312ef4c8737 SHA-256: a51898d41683668665ed68fabeb0e8f4a6fb38dbbb41e0679a15c5cd86c34503
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 0.9996

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://gimoguvi.ru/123?utm_term=frontier+ct+tv+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418777/normal_5fd818d77a4ae.pdfIn PDF document text
    • https://tegidaweriwasul.weebly.com/uploads/1/3/1/4/131483440/090f496f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_6035b8107d8ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461249/normal_603d0e060380e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368244/normal_5fefe686f32ff.pdfIn PDF document text
    • http://ludshop.xyz/torn_acl_in_dogs_front_legnjcpa.pdfIn PDF document text
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/gojobimafitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426551/normal_5ff612d92f483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456387/normal_6043916c821df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404987/normal_603c60d99be19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_604035a234f10.pdfIn PDF document text
    • http://legalvictory.group/86374894806xf944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_6025a75d7b571.pdfIn PDF document text
    • http://worodariravo.22web.org/18840641438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423715/normal_5fe7e76694150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_604353068d8ee.pdfIn PDF document text
    • http://mxbur.fun/mipivurow2yw40.pdfIn PDF document text
    • http://praktika-ingenieur.com/vibamibiizux2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455376/normal_6045e45c5ae0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakinopelijanup.rf.gd/vejisivodexidiwotiga.pdfIn PDF document text
    • http://mezujegaweb.epizy.com/94596393319.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_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 4700 bytes
SHA-256: 9cf5cb6b686bf039b2bb492fdb39f110495fb47d814b9d910bfd71afed6dfb55
font_01_sfnt_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 11444 bytes
SHA-256: e0691a10b296f48b8021c9c6cd3cb512b7552ce6f9d48d88aaeb73de00b2dce5

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