Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f84d791813f108…

MALICIOUS

PDF

101.0 KB Created: 2021-02-10 14:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 658bc652db115d6fbe8a0b8480c11b9f SHA-1: a5e3f2379eda5f5fbdedecb257e74fafcf2c7b6f SHA-256: 13f84d791813f1086ff936c9f0de5832f8042c7144e0667a355b75ed8c9ecc90
66 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with the primary one being `https://maypoin.ru/aws?utm_term=sd355+cut+sheet`. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://maypoin.ru/aws?utm_term=sd355+cut+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403406/normal_6011f42dbe0af.pdfIn PDF document text
    • http://dovulup.iblogger.org/sironuvumipemumetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_6009c05b39a43.pdfIn PDF document text
    • http://bobr.space/900021371928f6qe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447433/normal_5fd35014b8dc1.pdfIn PDF document text
    • http://bupro.asia/vevarilubojaratc2auc.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/1Uichas/lezevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fe3f860ad927.pdfIn PDF document text
    • https://cdn.sqhk.co/katafojedul/hiPhj4R/codemasters_f1_wheel.pdfIn PDF document text
    • https://cdn.sqhk.co/sesedazaw/S5k0jfi/verizon_wireless_roadside_assistance_coverage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_60127908718f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_600c8f37dead8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384480/normal_600312fcda3ca.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/h0l7fhf/street_racing_games_unblocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487423/normal_5fc94e58a0ea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454167/normal_5fd1791ea4dfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molaken.rf.gd/2015_chrysler_200_limited_user_manual.pdfIn PDF document text
    • http://fefadipif.rf.gd/gojunuwenakix.pdfIn PDF document text
    • http://fuxivupinamipi.rf.gd/53740297339.pdfIn PDF document text
    • http://kitalanexu.epizy.com/94954373946.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015358.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15358 28552 bytes
SHA-256: 54d64ecb99dee960e21950448e2be6c1ca23f99f829f6efcd40b924febb7afe5
font_00_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 5080 bytes
SHA-256: 402853e9af6e052ccad4199ad6ba9c9827a647ffec3cc8b45c472e5597b21aab
font_01_sfnt_off00012e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E19 11252 bytes
SHA-256: 4ade98a137f89e54b094aab9712090b25fc4c80ecf7654ca42ae3773117a56e4

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