Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a2ab53fd54c3d3…

MALICIOUS

PDF

87.7 KB Created: 2021-04-07 20:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 723829a0d7f8ad321e5e3221d9757096 SHA-1: ed4dc26f8030807c3c1a8e94e45e010f21cb93ba SHA-256: 21a2ab53fd54c3d357298256ae7c8582146413fa5dc33e051678c5e3afc3fb7b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous external URLs, including one pointing to `https://lozipotod.ru/strik?utm_term=what+does+3m+stand+for+shoes`. The PDF structure suggests it's designed to host many links, potentially for SEO manipulation or to redirect users to phishing sites. No scripts were extracted, but the presence of external links and the overall structure indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/strik?utm_term=what+does+3m+stand+for+shoes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427783/normal_602b7a1f12445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417988/normal_6066b57732ea1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378613/normal_5ff4976a8fe5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5feb45b4ef223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5ff4bf5861ce2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422658/normal_5fff97d38bb55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369653/normal_5fca7507dd7d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5fcbd645955d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_60351e9cc8cba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477921/normal_6007bb17ebd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_5fda0e4b1870c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_605ff9b27321a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0bd7dc-5552-44c6-9896-e9a5ca5ba18d/what_is_the_purpose_of_social_research_in_sociology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5537842-e526-49d2-ba36-0c9b133ae6f6/honeywell_th8320wf1029_connect_to_wifi.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_39e0248ac7b04a7da7696692f191033d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16109050-5afc-4577-a5b9-cdce61bfefa9/nuvalidefoz.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_7edde5e2a60b409eaddf48ce241c8e5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27c8373-9919-44bb-a00c-ad4d3eafa360/what_is_the_kinetics_of_a_reaction.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_188f91f3ad2d457cb4272a30c8329aa3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5577cef3-945f-4e77-b44d-3c66050caec2/98367274091.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_b453f97a23604a6e91402e8747a7b2ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/accc136b-a5ed-47cf-9446-b562890b0d17/pesazasuxetunuzipexoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e32658-734c-4435-b41d-c09e60ca603b/71326007189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca983723-ec9a-497d-9fe6-b5441de3f224/neil_degrasse_tyson_books.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_a9976dd357d24000ba80d449a03d8fbc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001170f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170F 5292 bytes
SHA-256: 09c70a24196ebb9c5705ca03e018d4bdfba2392cd6de4f87ebf14512b188a5a3
font_01_sfnt_off000128f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 11468 bytes
SHA-256: f3c166f8faa43e93f10aa6295cace6a2b02462852b2c0d9e78a7086bf4375cde

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