Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ad5b87e1349ff1…

MALICIOUS

PDF

85.6 KB Created: 2021-04-09 07:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c4e5e54c591a67aa7590163b0892a309 SHA-1: cacd6fcfdaca0bf06165b7b8ca99f604de214190 SHA-256: 13ad5b87e1349ff1b46cc7fe4366ac20a6555612d3199b757b075f4ad2418941
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text fragments and metadata suggesting it's a lure. The presence of external URIs, particularly one pointing to 'mezovuduw.ru', strongly suggests a phishing or redirection attempt to a malicious site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating the PDF is part of a link farm designed for disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mezovuduw.ru/strik?utm_term=mipc+camera+red+light PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379471/normal_60591f3d7df90.pdfIn PDF document text
    • http://hq-cleartv.info/sare_jahan_se_accha_piano_notesbk9xr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_60183cdfbab37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488100/normal_6058881a6f292.pdfIn PDF document text
    • http://trydouche.xyz/bible_study_lesson_plan_templateybsct.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/vozibatotasijakujisupuk.pdfIn PDF document text
    • http://fbdirect.site/faniwixas9rshu.pdfIn PDF document text
    • http://devlp.club/85915865481dgeu5.pdfIn PDF document text
    • http://floradoma.net/joker_script_dark_knightzip8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472775/normal_600b64b63b55a.pdfIn PDF document text
    • http://vuroxinizona.scienceontheweb.net/40232873246.pdfIn PDF document text
    • http://nebatomefov.scienceontheweb.net/kambikuttan_malayalam_cartoon.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://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_c50defafa38c4d53b5531aac1c3efdda.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_caeeaabbe0144560803f9b17f9826132.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4400a2b6-f36b-489d-b3a7-db1af5a7c07e/starting_a_low_carb_diet_plan_ph.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_2dc8d45531754399b00e95cd638eb668.pdf?index=trueIn PDF document text
    • http://kegigija.atwebpages.com/kogiwaralivum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82b9bcf0-b321-40bc-b0b4-c6cafb18f214/25579527750.pdfIn PDF document text
    • http://rikuworubit.myartsonline.com/86479893236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f87ce0a-bfef-49df-ac11-f75220a5e4cc/law_dictionary_english_to_hindi.pdfIn PDF document text
    • http://situwosase.myartsonline.com/small_church_building_plans.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_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 4884 bytes
SHA-256: 4aca8f6aebb5818ee1057faeba2d520e82d534315d3e5331036e1cfa703d6215
font_01_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 11452 bytes
SHA-256: 7a9fd1a3ae21842dce3f0ce85759a239d2b9e95034c9c98823fa34da004cb55c
font_02_sfnt_off00013aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA0 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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