Malicious PDF — malware analysis report

Static analysis result for SHA-256 17099667fff442bb…

MALICIOUS

PDF

83.2 KB Created: 2021-06-09 17:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4d747f7b59b5da00a5238eab21614a72 SHA-1: 236b084a01df675071574184b8cf48141ab0f521 SHA-256: 17099667fff442bb672e325d5f5b10ef2874441ebc65a7ad1fd02307c8168997
186 Risk Score

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 0.9990

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=christine+ann+lawson PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487626/normal_5fee445a2e926.pdfIn PDF document text
    • https://zejabiforisog.weebly.com/uploads/1/3/4/2/134266870/xiwazag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_600b0b2cc5f85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_60186cf367269.pdfIn PDF document text
    • https://rovetizewi.weebly.com/uploads/1/3/0/7/130776299/kudosuwel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382976/normal_5fc737812af3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_603a747c34937.pdfIn PDF document text
    • https://xumagatovonag.weebly.com/uploads/1/3/5/3/135312495/lanijefosaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383577/normal_5fc9b436186ba.pdfIn PDF document text
    • https://disavapiviloma.weebly.com/uploads/1/3/4/3/134351159/xudajazebilalizaduni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495985/normal_600b632a1c60a.pdfIn PDF document text
    • https://gogozofoful.weebly.com/uploads/1/3/4/5/134512065/pofok-maxezuxuto-witumajuxaw.pdfIn PDF document text
    • https://lebotowim.weebly.com/uploads/1/3/1/4/131438344/7526818.pdfIn PDF document text
    • https://waxagenejefud.weebly.com/uploads/1/3/4/7/134712445/lovaripopuzipig.pdfIn PDF document text
    • https://pilumana.weebly.com/uploads/1/3/2/6/132683063/ranitun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_5fd9a56e8eb8b.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://tebejeloxid.pbworks.com/f/11327419703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb2feea-a7f6-45df-a6b3-65fc106cf5a8/first_alert_7010b_vs_9120b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d61cc1-6497-45a6-8a29-20ac5643efc2/70336343176.pdfIn PDF document text
    • http://kedajawi.pbworks.com/f/quimica_universitaria_garritz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72373ccf-eafd-4b49-a44f-c87297eecbea/timex_t617s_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c59689f-32bf-49a5-8d81-f19854e6f574/what_makes_a_bond_polar_or_nonpolar.pdfIn PDF document text
    • http://rapigidezuw.pbworks.com/w/file/fetch/144872706/91422593076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2256820-49d2-46fb-a176-0a8f93f4799e/212_the_extra_degree_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 4676 bytes
SHA-256: 9e9bdd8cb9b298ea3dc9fafa6be21504d7c5f4d2eba2eb2e9c2189a65724aea2
font_01_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 11008 bytes
SHA-256: a32d6fed01228b6c414fb47f0c51e3bb0f3794643efcaea6441de3c5ac3f0690
font_02_sfnt_off0001314d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361