Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f72adcc66ba293…

MALICIOUS

PDF

75.0 KB Created: 2021-01-18 18:34:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b30ed060607705d63575b2f4bdfa377c SHA-1: 9220e5553aec88293e29d048ba693fbf1e0971d6 SHA-256: 98f72adcc66ba2936f62c777978de0eab0c32ee166de5d24bbd22c3c75e8e06d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, a common tactic for SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and numerous external links suggest the document is designed to redirect users to potentially harmful content.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/aws?utm_term=billboard+awards+2018+mp4 PDF link annotation
    • https://fubaxuzepavuzoz.weebly.com/uploads/1/3/4/7/134755559/dadavogefozav.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleratupo/iiaD6Ay/english_songs_download_mp3_isaimini.pdfIn PDF document text
    • https://fuzakeraza.weebly.com/uploads/1/3/4/8/134848422/10fcde54cbdf8a.pdfIn PDF document text
    • https://site-1178527.mozfiles.com/files/1178527/kobulev.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/2c3551d8a849.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/bulatimorazi.pdfIn PDF document text
    • https://cdn.sqhk.co/sazoteva/kxhc2hf/8366690692.pdfIn PDF document text
    • https://rizaxobekame.weebly.com/uploads/1/3/4/6/134698747/e8aec13b1.pdfIn PDF document text
    • https://jimurapixow.weebly.com/uploads/1/3/5/3/135399705/falatezo.pdfIn PDF document text
    • https://fejopipuzag.weebly.com/uploads/1/3/4/3/134308805/doxos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371272/normal_5fc654cdef079.pdfIn PDF document text
    • https://site-1167928.mozfiles.com/files/1167928/kutisuvekapaguwukolakefus.pdfIn PDF document text
    • https://site-1176575.mozfiles.com/files/1176575/hexagon_quilt_template_printable.pdfIn PDF document text
    • https://site-1174503.mozfiles.com/files/1174503/google_sheets_if_then_statements.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 5996 bytes
SHA-256: f94ca23a341e4ccad835c208b3eff2d8c19e66155991b6552273b0aedc6a06bb
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 12552 bytes
SHA-256: c330eea430d1aa85affb942d11c7a7ed33480f9c07e436cac1469afb415c7b85

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