Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a98a97672311951…

MALICIOUS

PDF

87.6 KB Created: 2021-01-31 01:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 13a2092ffdac876f72b715310e6881ea SHA-1: 9f506946f337556666bd28be854d04754b8e4a9b SHA-256: 8a98a97672311951911d99633043dbd766d02f6d4ab3bee3456047cf1b2d9ed4
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple suspicious links, including an invisible link to a domain associated with phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document's content, though obfuscated, appears to be a lure for 'antique door stops', directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=antique+door+stops PDF link annotation
    • http://profapp.pro/gatisurokonizapewufo641gh.pdfIn PDF document text
    • http://test123test.xyz/3257317033qqk3a.pdfIn PDF document text
    • https://lakiromepokina.weebly.com/uploads/1/3/4/5/134589127/9f54483.pdfIn PDF document text
    • http://com-login8.xyz/lantech_stretch_wrapper_manualxa6wo.pdfIn PDF document text
    • http://autolombardpro.ru/kedapazoxesibiwegabonojyrnlm.pdfIn PDF document text
    • http://praktika-ingenieur.com/the_roommate_rotten_tomatoes_scoreiwu7m.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/Z6fGvzK/xewetuzirolesasitamatuvi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378607/normal_60098434c6318.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/1hajhcm/panipidodupaninasuwed.pdfIn PDF document text
    • https://cdn.sqhk.co/xoguvamev/lgdWpgh/55942544773.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/sitozi/47189562753.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/78606702713.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/73397932365.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_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 4824 bytes
SHA-256: e25549dffeb5638487ce8b95e17ad087868934c2b8f76dfeec9836e95cf70f1f
font_01_sfnt_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 11212 bytes
SHA-256: 4b2d357c9fbc4f1748e579d5802b7ddcf970987c04bc371d19abe886667a31af

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