Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1a0c75b7b8f171…

MALICIOUS

PDF

64.5 KB Created: 2021-02-15 00:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 81ea9d382675241f8b91395cf7a9e7f2 SHA-1: ea81da9ea64932cfd845bbc29f216ca3f827b42f SHA-256: 2b1a0c75b7b8f17155e2e597a458debfaa373852993c6927948d24b6092b78b9
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://seumenha.ru/123?utm_term=wii+sports+rom+iso PDF link annotation
    • http://instapriz24.online/591388218323pyqg.pdfIn PDF document text
    • http://accueilcmb.com/lei_organica_80806qy5m.pdfIn PDF document text
    • http://goldstein.berlin/christie_marie_sheldonms6nk.pdfIn PDF document text
    • http://pr-bux.online/riridivazalipuxikemejasevoct.pdfIn PDF document text
    • http://regvoolkim.website/i_m_going_up_yonder_sheet_musiced1k3.pdfIn PDF document text
    • http://managerprogram.live/hide_and_seek_biscuit_cake_without_baking_powderriteu.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/nalafur.pdfIn PDF document text
    • http://hotita.space/52635445191rrwxr.pdfIn PDF document text
    • https://dexovepiniputo.weebly.com/uploads/1/3/4/4/134400909/jixogid_dekugavu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415077/normal_6001c9bbaf1b3.pdfIn PDF document text
    • http://chambrehq.xyz/botigurikosenozinuwaj1bl.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/mivokozibu/cuttable_acrylic_plastic_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/jojulojiwisosifemiju.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/92776696683.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/puzugaxibetelidilu.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_off0000c12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12E 4736 bytes
SHA-256: d3949d2b064bf3c1db2dfa5fec208cb4be7d592af5bfa039911ebd0df0225c1d
font_01_sfnt_off0000d141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD141 10560 bytes
SHA-256: 757042995a636fe668a7facabfbe542e5d297406fb60c270d550b804d06e2975

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