Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffd45d0f888db28…

MALICIOUS

PDF

76.9 KB Created: 2021-06-14 06:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cf5673fb4720c82a8cfc21ed2fbff1ec SHA-1: 7be259daa3266a55d673cc562fc4f8883f814fa8 SHA-256: 9ffd45d0f888db285ec6c445a7042718ccd2a9f69099c17f1456e2e3f34a5306
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://crysiq.ru/pbw?utm_term=call+of+duty+zombies+apk+obb', is presented with a search term related to game downloads, which is a common lure for phishing or malware delivery. No scripts were extracted, but the PDF structure and numerous external links strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://crysiq.ru/pbw?utm_term=call+of+duty+zombies+apk+obb PDF link annotation
    • https://faruxolumapegi.weebly.com/uploads/1/3/5/3/135341403/vawul.pdfIn PDF document text
    • https://doxagazezuzizum.weebly.com/uploads/1/3/1/6/131606815/doligilor.pdfIn PDF document text
    • https://nixejovebomir.weebly.com/uploads/1/3/1/3/131380485/vopoketiri.pdfIn PDF document text
    • https://wivetagimogik.weebly.com/uploads/1/3/4/6/134618772/999695.pdfIn PDF document text
    • https://vajuwapokovis.weebly.com/uploads/1/3/4/3/134361820/gosinid.pdfIn PDF document text
    • https://muxolebutelun.weebly.com/uploads/1/3/2/7/132741382/8769807.pdfIn PDF document text
    • https://miwejezapelo.weebly.com/uploads/1/3/4/3/134342363/genopejovexiwovemas.pdfIn PDF document text
    • https://nizufamira.weebly.com/uploads/1/3/4/3/134310662/jevofolamezuda-darefizoxobexi-kapov.pdfIn PDF document text
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/ziwetanazilo_kobasomo_ranixewifume.pdfIn PDF document text
    • https://palokeligiz.weebly.com/uploads/1/3/4/4/134496709/fogoxeralimozusuw.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
    • http://metudebebi.pbworks.com/w/file/fetch/144658260/80696259782.pdfIn PDF document text
    • http://lulatigono.pbworks.com/f/mijelominokobipolozelixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd7fdd1-3323-4ed2-b2e3-67096cde2178/kuxadexebajedakurumukekid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c09dc8-d4f7-44a3-9a4f-3110a8eb4647/formato_hoja_de_vida_funcin_pblica_del_portal_sigep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/487b9f13-b7fa-48ca-8d32-6bc460c4f000/79022116190.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144574377/duzuvenodofeme.pdfIn PDF document text
    • http://pajawazo.pbworks.com/w/file/fetch/144779778/gebadipamewubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35891a4-e177-427d-953b-23f346c5e618/ingenuity_inlighten_bouncer_reviews.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/jupozomupiwer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af2ecfe-9a15-4692-88c9-e8cc6a52757c/academic_writing_for_graduate_students_essential_tasks_and_skills_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddc8bd5-322e-4639-a813-9192d53b8d37/2996098246.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/f/71114604873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a5ab92e-fc40-4e90-acff-26e0c91abae4/fakuvaxukefijirok.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/w/file/fetch/144709374/jevevolilaponofadexexilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c72b52d-d919-4cc9-97a4-c1f58464aeb2/harry_potter_first_book_chapter_summaries.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 5244 bytes
SHA-256: a90715f9fa3492a03d766fabea8574f1ff71355b02f2cbeff101de688f8600f0
font_01_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 11344 bytes
SHA-256: 70fe88e6f3f26ccbf0cc44059e22f194ff95adaba3394dc97f5bf210ad41ed5d
font_02_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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