Malicious PDF — malware analysis report

Static analysis result for SHA-256 733786d9761093b6…

MALICIOUS

PDF

99.8 KB Created: 2021-02-17 05:20:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01996183aae3d8b574549f22ba9a43ea SHA-1: f85bcf3aa169151389c3920b9017f437ce02e772 SHA-256: 733786d9761093b6468c060d962bddc4fd05602239147686377e2884efae0ab4
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing/trojan content. The document body, though heavily obfuscated, appears to be a lure related to 'audiobook free', aligning with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic which indicates a link farm on disposable hosting. The presence of external URIs suggests an attempt to redirect the user to malicious sites.

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://maypoin.ru/aws?utm_term=a+voyage+long+and+strange+audiobook+free PDF link annotation
    • http://ndfnasg.xyz/clinical_success_in_endodontic_retreatmentsf9dh.pdfIn PDF document text
    • http://tidajipameme.22web.org/aashto_m288-_15.pdfIn PDF document text
    • http://rankingcoach-seo.com/legopatugemovogakokoo4d53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379046/normal_5ff1f0afe4f88.pdfIn PDF document text
    • http://lnstagram-helping.live/zudizoxefewogapibuvogj5jj4.pdfIn PDF document text
    • http://disclosures.space/omsi_2_bus_simulator_free_download_for_pc5zewa.pdfIn PDF document text
    • http://nigma24invest.online/90044793671q2zwd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464861/normal_5fccb3a1e0b5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369660/normal_5fc9783e9c739.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://retuguru.epizy.com/dojedujeda.pdfIn PDF document text
    • http://sobegomogi.rf.gd/vajizexonem.pdfIn PDF document text
    • http://besevinoferoza.epizy.com/95021873892.pdfIn PDF document text
    • http://tobitutivarod.epizy.com/pufijigok.pdfIn PDF document text
    • http://timawerana.epizy.com/golden_earring_drum_sheet.pdfIn PDF document text
    • http://tinosizifaxuful.epizy.com/tafopowafafamudamupazisib.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_off00014a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A05 5428 bytes
SHA-256: cb7db6319523983f28c1be8a41a17e4e1f85328d57e5ded66a1abb67aeb7609a
font_01_sfnt_off00015ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA0 11508 bytes
SHA-256: e7bf52114909890708f14f80d4674346a415de5ecbccf3fa1b01dbadaf7b16d5

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