Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f1457e707ec802…

MALICIOUS

PDF

88.6 KB Created: 2021-04-03 03:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1f05868253824e4a4efefd7db0397cc6 SHA-1: 23e8817508d9b696ebe5b5b830682610b5e0f228 SHA-256: 85f1457e707ec802c1f45472da2bbf47ad699cb63c868aa9c3ef6d3ceee2ea3b
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including a specific ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links and its classification as a link farm on disposable hosting suggests a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://golowaki.ru/award?keyword=comparative+superlative+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423148/normal_6018ccf7b2e45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475197/normal_601f99c1d3e09.pdfIn PDF document text
    • http://nudazemuxebabu.22web.org/general_aptitude_test_papers_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/haVTjiG/45612072834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_604f97b7302d0.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412897/normal_6031191c87fb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_6056f98ab1c05.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/2e28b2e8-8f2c-4256-ba2d-7277e9aec5b5/verb_form_exercises_with_answers.pdfIn PDF document text
    • http://rinexijirava.rf.gd/captain_america_300mb_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d36ab8-2449-44fe-b9f8-7f570719504e/98126265966.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_ca2d53fce74248d490af1f518e1a6873.pdf?index=trueIn PDF document text
    • http://pamemoroza.epizy.com/14824848872.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_c1c2353b06c3407a8fbf8092cc8e2767.pdf?index=trueIn PDF document text
    • http://xofukadebinomo.epizy.com/google_cardboard_camera_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06f96ff-164c-4cc7-b509-9823f38f2103/what_makes_a_good_sales_pitch.pdfIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_9f122c9f44d046e38366ad648c8ab643.pdf?index=trueIn PDF document text
    • http://gakelapirafit.epizy.com/79638032742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e76092-238d-4678-a26d-e2ec66c5ed92/20916943724.pdfIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_3765b58d58484632901e9a82133ba310.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebed9245-609d-41e3-a416-01e1e1cfe433/why_you_shouldnt_buy_a_keurig.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_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 5152 bytes
SHA-256: 4cafaa2775f32333e0ff0d6117ac7b7f57b286ec41588c6cf450f19e38316c39
font_01_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 11208 bytes
SHA-256: 442c95f6c0d2b63476d401e3e059b4ae75ddf88057d7773b4db0d1d46c1fcdca

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