Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b70328fe936923…

MALICIOUS

PDF

77.0 KB Created: 2021-02-15 23:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e614a80baff7415abf4dee99bcbabca4 SHA-1: f641c9d4f80dd99ba8359fbab75844b21391a19b SHA-256: 31b70328fe936923f844c0ce4aa0ebc389336b3bf2f0dc198d5e08675d5f9a14
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, identified as a link farm, with a primary redirector URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of a link farm points towards an attempt to manipulate search engine results or distribute malicious 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/123?utm_term=my+son+the+fanatic+character+analysis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404959/normal_5ffdb5cd1c895.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/sigA7h4/badonelas.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/jfajavg/47649855787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388060/normal_602369fbae520.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462341/normal_5fed9332d4bbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417995/normal_5ffa41f9cf488.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/ZhjYFmn/33706835042.pdfIn PDF document text
    • https://cdn.sqhk.co/revikokelobu/JjhpaPa/find_my_phone_number_location_for_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_5fe8a2462729a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5fe0dec51f19b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_601f242ceee1e.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/XhcP6PX/kukosirexopumejato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476434/normal_5fd3397abba68.pdfIn PDF document text
    • https://xukotonaxi.weebly.com/uploads/1/3/1/4/131453431/pabibofem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493917/normal_6007288ec1c5b.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/luworizesupox/porukiwekibevobiropi.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/gift_box_svg_template.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/negimaxomoga.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 5076 bytes
SHA-256: 33efafaea566ebce25e3667825f4e9a152ad3b78986efee21cedbd62d7742b43
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 10532 bytes
SHA-256: 1f0e4580b4763763379c1ce335c3bdb9b2bbbc86d3bd3ae7d0d87ecdd42f4be3

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