Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6ef2accdfc1999…

MALICIOUS

PDF

77.2 KB Created: 2021-04-05 19:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a3670d8f97c88422bf4ef9f925f1701 SHA-1: bf6ab7dd3c518846cf12d2ab029d3c0f32ee2f0e SHA-256: 7a6ef2accdfc1999be70198ba1df60f589818e988c028dee304988a3cc9af6c1
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs pointing to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of external URIs and the overall heuristics strongly suggest the PDF is designed to redirect users to malicious content.

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://xezojetit.ru/award?keyword=approaches+to+educational+planning+pdf
    • http://tafugegajotu.mygamesonline.org/39580813315.pdf
    • http://warajuvevuv.medianewsonline.com/zakokitagexusazuzinar.pdf
    • https://cdn-cms.f-static.net/uploads/4446264/normal_601608aa4da3a.pdf
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5fd13c0023568.pdf
    • https://static.s123-cdn-static.com/uploads/4385413/normal_5fedff1dd4571.pdf
    • http://kungfumalibu.com/what_does_the_lake_smell_likebjgys.pdf
    • http://pejokepi.mywebcommunity.org/ielts_academic_answer_sheet.pdf
    • https://static.s123-cdn-static.com/uploads/4423715/normal_6007e2af5fd37.pdf
    • http://rupazaduxil.mywebcommunity.org/biology_book_class_10_free_download.pdf
    • http://trynon.xyz/gixezosev9g9p.pdf
    • http://sreda.city/conflict_resolution_skills_workbookzpopa.pdf
    • http://xuritepizib.mygamesonline.org/28116038339.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9dbfd36b-42e1-4e59-84bb-c5ddb6fe1d84/why_did_they_cancel_the_exorcist_tv_show.pdf
    • http://wulibazosuxib.onlinewebshop.net/ronenukujiwudurux.pdf
    • http://ritumogadoj.onlinewebshop.net/74015037960.pdf
    • http://wizigipixe.atwebpages.com/mimogakokamebim.pdf
    • https://s3.amazonaws.com/mukut/44997379245.pdf
    • http://japinoxizidunub.myartsonline.com/what_is_popular_culture_google_scholar.pdf
    • https://uploads.strikinglycdn.com/files/5eb9cb89-ab34-4e7e-9851-d7210d0d08a2/why_is_there_a_blood_spot_in_my_eye.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/sedeve.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f009.bin
59fffda961bd18ef717975da06b83350cd40762b534ef9296047b7ad355d99ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 5408 bytes
font_01_sfnt_off00010267.bin
ef009dff712e01c6f03bce802cf072435e8978968b7d50a9d85c528e7d476285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 10388 bytes

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