Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7eaa22c8b2280e8…

MALICIOUS

PDF

75.0 KB Created: 2021-06-10 11:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7295c82f3f9d60d7e124cb995c401963 SHA-1: 90cb4c4b5039fdefa9793986048b5c001beb0efd SHA-256: f7eaa22c8b2280e836705125af317a5faacc59ef67ae8ef369a2bfb42ac88054
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 0.9997

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://laborke.ru/pbw?utm_term=factoring+trinomials+worksheet+answer+key PDF link annotation
    • https://pulamawuba.weebly.com/uploads/1/3/0/8/130873907/9118546.pdfIn PDF document text
    • https://lisebilapuwuw.weebly.com/uploads/1/3/4/0/134096741/ce8109d6f5c.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/kotobesodaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417040/normal_606e5853392d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_6064f7f5648ee.pdfIn PDF document text
    • https://tutemedoz.weebly.com/uploads/1/3/2/8/132814241/8125072.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/2863920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446772/normal_6063d42792267.pdfIn PDF document text
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/kumezebuniziwer-miridibozevu-tobofozexuti.pdfIn PDF document text
    • https://tuxinotem.weebly.com/uploads/1/3/4/8/134883911/d30f52b2888c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5fda23ea180ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462344/normal_6035c6f0a1d50.pdfIn PDF document text
    • https://mubelumovetofap.weebly.com/uploads/1/3/1/8/131856402/lepot.pdfIn PDF document text
    • https://bemixujigimo.weebly.com/uploads/1/3/0/9/130969474/7052009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470228/normal_606822df02510.pdfIn PDF document text
    • https://kigolakelo.weebly.com/uploads/1/3/1/3/131380934/ce548eb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_6042f8223f3ed.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/2502885.pdfIn PDF document text
    • https://wanalupegekiful.weebly.com/uploads/1/3/4/8/134879682/rizap-labolimimagogix-vowesuvejonimog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lekipirunezi.pbworks.com/f/79535583770.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144562974/sidapegi.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_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 5424 bytes
SHA-256: 991481ad04ce51dcd6c238ed87c6730d7a6f9c2a00c29cd1998119fc7373bb9b
font_01_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 10360 bytes
SHA-256: 36f4ec2e211d965f2f9cdbcd3edb0f2573f20f4572328f1679f85907e37ebf60

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