Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8969835048dad91…

MALICIOUS

PDF

75.3 KB Created: 2021-04-05 09:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 221385cab2d0c5fffdde02ce31f8ea81 SHA-1: 35b4235a7f20af816120c027a0992bc0e4daaf64 SHA-256: d8969835048dad91d45e7b6d7ed68e14ff394556a8fc461b172c2a2673f8d9bb
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a 'utm_term' parameter suggesting a tracking or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm for malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/aws?utm_term=bodyweight+routine+no+equipment PDF link annotation
    • http://datingdate.site/9033647025jasub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5fd63b186ab3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383922/normal_600890f71580d.pdfIn PDF document text
    • http://sokfresh.fun/bt_notifier_downloadpy0ds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_603d00ca9ab00.pdfIn PDF document text
    • http://nemagufi.mywebcommunity.org/modal_verbs_exercises_intermediate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_60199db8c26e8.pdfIn PDF document text
    • http://fly-drive.online/vcds_18._2_romana10s3r.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/kanumewef.pdfIn PDF document text
    • http://palawawez.mypressonline.com/woneduju.pdfIn PDF document text
    • http://tiktokfrance.fun/rinovawi4dufl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_605c16c734fce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_603b932a498ec.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/makumapikeze/59877396736.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/eldest_christopher_paolini_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/appsc_aso_previous_papers.pdfIn PDF document text
    • http://poborunedajemo.onlinewebshop.net/bronchiolite_traitement.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/vutigitilazegipofajanemen.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/ridiculousness_full_episodes.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_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 5320 bytes
SHA-256: 0eaf5410e21fc3dc12ea8e68a8c6a98c07731c01b2b19e4bce459d08f65486d2
font_01_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 10584 bytes
SHA-256: 1b3a0455c230f7b95ad342edda42e74790744e50e4a4fb2471f50cf552751f44

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