Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd6197149a08cbe…

MALICIOUS

PDF

148.0 KB Created: 2021-04-03 04:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 55a783b07090b2e876978b87dcaf0040 SHA-1: 5c25e1a6935dfee511791d3a5187be7aef9609f8 SHA-256: 5dd6197149a08cbe2d2f39a28f7609a8f1f08c5f3cecefda9e0c6fe7143bb8c2
146 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. It uses a callback-phone (TOAD) lure. 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 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://resalured.ru/strik?utm_term=unitedhealthcare+provider+number+authorization PDF link annotation
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/8723835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_6032559e0e091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500669/normal_6044dab33093f.pdfIn PDF document text
    • https://resusogid.weebly.com/uploads/1/3/5/3/135346187/batapaxironiv_xodagesa_bezovag.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/8932690.pdfIn PDF document text
    • http://jefuvumerusew.getenjoyment.net/41464158660.pdfIn PDF document text
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/1089882.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488323/normal_60095a0612ccd.pdfIn PDF document text
    • https://duditoza.weebly.com/uploads/1/3/2/3/132302736/eefcf858d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_6056e02bd5811.pdfIn PDF document text
    • http://bimizuzi.sportsontheweb.net/62878521363.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/the_grand_miracle_cs_lewis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5ff772c3d7201.pdfIn PDF document text
    • https://wipusometava.weebly.com/uploads/1/3/4/8/134846349/4757181.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xupimaral/citi_card_benefits_guide.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_5104c5cf2792427994a2db246e2979a6.pdf?index=trueIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_a2e3e691e1544424b23eb8bcedcd760d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifomi/penuvosudolok.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/90701406277.pdfIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/surah_naziat_with_urdu_translation.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_378b489a5a1d4c37a59d147f10503e54.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_9966ba858f1e46e0a3feb518675c630e.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_5ae6212934354fbaa8265083f6999255.pdf?index=trueIn PDF document text
    • http://pudolajuji.atwebpages.com/sirakowetarilusuxaj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F354 5376 bytes
SHA-256: ee5032c3d11f9410be57ae9ea67b0506d5e37cc5c03d107c02bf5c9309b35856
font_01_sfnt_off0002057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2057D 11212 bytes
SHA-256: 63fc69ff31ef5c5073e38aef2f1105e3c6786f4c57b9e050d43ac612b1ebe0e3
font_02_sfnt_off00022c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C18 16232 bytes
SHA-256: 0865ea5686e30d19842a941efae749c2e92da649021023aa876fc32c67f43dd0