Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc74e4bf6eaf5139…

MALICIOUS

PDF

79.5 KB Created: 2021-03-21 23:04:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cf58fe9901b35effb3bb36ef24b4e348 SHA-1: e9f1c89a98f149b6b5fb6eb2a1b796cbc38281d3 SHA-256: dc74e4bf6eaf5139b806641c56b12ba738cc35199d0917d027b27c3d17db033c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=how+to+write+research+outline+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454547/normal_603a0ba85f949.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380226/normal_5fe3f7a2d8ec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454424/normal_5fdbb556ecd92.pdfIn PDF document text
    • http://xabigaxen.22web.org/44722955655.pdfIn PDF document text
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/8901215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_60169142521c1.pdfIn PDF document text
    • http://padesuwajawal.22web.org/70030009966.pdfIn PDF document text
    • http://kuxogajow.iblogger.org/tanupokenuzajax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_60267e4055692.pdfIn PDF document text
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/zajupulubigoko-tozenakilawa.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/tizowodifi/gizewabebu.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_1569bb0a30544c1b886af07c748e5b13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bogeguva/99466845466.pdfIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_9465434952bb47e18f7fece545c099b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0090e2-7b8a-4349-b68d-18bfb798878d/61918402421.pdfIn PDF document text
    • http://dunosijeg.epizy.com/dezaxaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4707ac87-510f-4f30-a7e6-7e81bee8d0c0/nezizovus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffde74b9-4156-48a6-af8d-ade31088f2d7/briggs_and_stratton_20_hp_engine_oil_filter.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_a5714dc0c5ec454c9e8edb36097f7e74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/why_is_my_verizon_remote_flashing_red.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 5296 bytes
SHA-256: 604bb19ac88677ae5ef10699a0e981e34f72b11405122aa51d0ed52afaf83dc2
font_01_sfnt_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 10648 bytes
SHA-256: 32a82c6c832767af0acb0853d3c1541eea51ccf81293468d0acb29a9b7bc28c2

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