Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42be3b73086c52e…

MALICIOUS

PDF

78.7 KB Created: 2021-03-27 22:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c679dddd638e53d951a3ffe4259c1d28 SHA-1: df390b60517dab77a79d8264706d6fcf0db79f85 SHA-256: b42be3b73086c52e9cf59eda071e0425a272b4cd41db4994e294f85376f36942
186 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. 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 0.9954

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://bologen.ru/123?utm_term=british+gas+smart+meter+instruction+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483586/normal_600a4d1a79cc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_6011039dd3dff.pdfIn PDF document text
    • https://fulesinarube.weebly.com/uploads/1/3/4/7/134729099/e019cc76a.pdfIn PDF document text
    • https://zaxadumumuguxe.weebly.com/uploads/1/3/1/4/131454216/gapepirunap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_6048ca79d8bc2.pdfIn PDF document text
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/9689934.pdfIn PDF document text
    • https://pagununida.weebly.com/uploads/1/3/4/8/134861868/pilafut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466391/normal_5fc5d177a572d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427820/normal_5ff91b4ad6ed9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369786/normal_5ff19d44e2393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_604513a39ed1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473619/normal_6026247b1ed0e.pdfIn PDF document text
    • https://diwekivoveludu.weebly.com/uploads/1/3/5/3/135313391/juxokiko-duzidi.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/846893f0-1711-49ab-82e6-b70e88e1f704/87357950629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883461e8-ac29-4e5a-97f9-93544f2ff60a/81240201265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c21602-fe7f-4df2-a67d-4a14b4ea6f2d/how_many_calories_in_a_medium_sized_sonic_tater_tots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8eb6896-879b-4ebf-ac4c-be8ff7189807/how_to_use_midi_keyboard_in_ableton_live.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b82d3675-c4e7-4217-8f33-36bfb17dea3e/zones_of_regulation_strategies_preschool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8edc5320-cc8d-46db-812f-6eddb27c4cb6/givupuri.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_70ae6d4e793646eba104298fe60f1bba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc8a814-eb43-4124-98a2-590e06b4340b/sony_fs5_used_for_sale.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_42069e201a7f4f06b9734c56e58ffcfc.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_11bfce1069d24d4bb9608be981f9d50c.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_4a3d99c6f26f4032b99a05c8a9b6f160.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a97ed1-24e3-4a3d-9cee-6caae2aa0b9b/how_to_delete_bluetooth_device_from_jvc_kw-r910bt.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_a0cbef5a62b44f41a8cde43e5cc7e1e6.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_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 5144 bytes
SHA-256: 90fce21f2d1a7dbeeb4463cf8228ee424c90bd9724d58411961ba204df039e8a
font_01_sfnt_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 10756 bytes
SHA-256: 154665eeb0a15ce0bee58f776a0f6bd7d9e8eb145c27a2e8f8dc4feab289b7a0
font_02_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3