Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0db3dc21bdc84c7…

MALICIOUS

PDF

81.2 KB Created: 2021-03-18 10:18:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2e1d4640768bc4ea48d70de0825581f0 SHA-1: bdb4fb49db1044d625662b4ecbcd9ed7cfe85302 SHA-256: e0db3dc21bdc84c733cb0291b0bc8859a512f6208ad772a0e5dab487a09c07f7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The presence of a link farm on disposable hosting, combined with the 'farm logo design templates free' lure in one URL, suggests a phishing or spam campaign. No scripts were extracted from this sample, but the extensive link farm indicates an attempt to redirect users to potentially harmful content.

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://gimoguvi.ru/123?utm_term=farm+logo+design+templates+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491725/normal_5fc99ea7bedc8.pdfIn PDF document text
    • https://gewolokumopez.weebly.com/uploads/1/3/0/8/130814623/gufowivuxeditazok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420020/normal_5fde278037886.pdfIn PDF document text
    • https://cdn.sqhk.co/soxesemu/O8hfpuI/27834159777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_6027c65a6c8c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_604b8dce6db6b.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/vusurigazoxivamasokekopas.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/Aggpic0/lemon_cake_recipe_easy_scratch.pdfIn PDF document text
    • https://cdn.sqhk.co/zunowexafa/gjbkgcM/boomerang_movie_review_telugu_123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_5fd92e5ed3ee0.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/IuhcifW/surgical_clearance_form_template.pdfIn PDF document text
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/0bc2dff892.pdfIn PDF document text
    • https://cdn.sqhk.co/jobubexivex/hc9Oygg/43808781349.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491155/normal_5ff773f761924.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/jepukifus.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
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_b52d347512824bc68bdc254b16a9b06d.pdf?index=trueIn PDF document text
    • http://moxuzaridob.onlinewebshop.net/vecteur_directeur_et_vecteur_normal.pdfIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_f6c22f5fa5a7444f9209e3196f02ace7.pdf?index=trueIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_4caa3103e109401c9948665f07aaa964.pdf?index=trueIn 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_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 5104 bytes
SHA-256: 8e30067a8403e2138fafe3272906b6f85c588c2760caeefba99f9be3657e2448
font_01_sfnt_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 10748 bytes
SHA-256: ce07e2a0254d4d28d50d3ab77d1cffcee030f00c7b8d526591f9485cae9932c7
font_02_sfnt_off000129ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361