Malicious PDF — malware analysis report

Static analysis result for SHA-256 085cf68f4849b5a0…

MALICIOUS

PDF

84.6 KB Created: 2021-03-25 01:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3ee963119545469389a76b43d1736b61 SHA-1: 596c88e792b5a27919d6a2d001d73e591a454e5f SHA-256: 085cf68f4849b5a014433fa92c5b3afb6bc9fdaa0b6c921a21c74756614e08ae
226 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further indicate malicious intent. The document body, though heavily obfuscated, contains strings related to software cracking, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jumiwimov.ru/123?utm_term=avg+pc+tuneup+2018+full+crack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487903/normal_604a2bf9c72d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426953/normal_6005b630d0eef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447093/normal_60493d4730e84.pdfIn PDF document text
    • http://sagebiwepul.22web.org/intro_after_effects_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_6016023fc8b94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407729/normal_600bdf743cc77.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://uploads.strikinglycdn.com/files/33e69054-41b0-42fc-9f9b-3d732cd54298/13403806258.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_26e336963b224dbea2c0a55902bc60cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc19d62c-61d0-48d1-8908-ea68ca706642/how_oxygen_concentrator_works_video.pdfIn PDF document text
    • http://fejivexol.epizy.com/kozum.pdfIn PDF document text
    • http://xezorepolik.epizy.com/alchemy_ios_game_guide.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_3dc807a70260429380d1232ae138cad7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6887586b-b6c4-473a-af6e-72e6382e4725/telugu_short_stories_with_author_name.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/8th_new_syllabus_tamil_guide.pdfIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_1ddc40c05b994917bd7c56eac2ff0abe.pdf?index=trueIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_72d450bed55e4ee5aaf2acbd4223196f.pdf?index=trueIn PDF document text
    • http://dipuvomefig.epizy.com/lupub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0e435b-9271-4312-91f8-d47fc3d8929f/history_of_modern_world_calicut_university.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4590361e-e2a9-4a3b-bf87-831bf87d811d/69669644608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba1603d-0185-4d4d-b65f-04db053f9b66/black_and_decker_gh3000_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/41413634953.pdfIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_ead4f37ac5d040588449c320e3e98bb8.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_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 5364 bytes
SHA-256: db6887e59ce0195b3795c1e1be3109be3b2606a804f4489f2286d43eaeb7426a
font_01_sfnt_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 11116 bytes
SHA-256: eae652c263cae860f18a0d5683e60d90efe09c26d00f8be0ac58f29ab5d1fefb
font_02_sfnt_off000136e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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