Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa644e7cd4226f3…

MALICIOUS

PDF

68.2 KB Created: 2020-12-15 01:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6bf3aad24bafbc5682a4a037c22c471a SHA-1: 9088ba50ceca9bf5ea1d3affa040def1141d23c9 SHA-256: dfa644e7cd4226f32cae75318d5b927773c9a085b9f444c732b008203439972c
196 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, many of which point to SEO-optimized PDFs, and one specific URL is identified as an SEO redirector for free-download phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a link farm designed to funnel users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=1st+edition+d%2526d+monster+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5fbdefd858328.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/9898689.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/taguxiveboru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_5fd7f9098c67e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451762/normal_5fc3bec9d7866.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/lorerexeg/63949535036.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc198131452f90b7fea3a07/t/5fc4e6325147b14804cc424e/1606739508110/epson_ultra_premium_photo_paper_luster_profile.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4e929d79364840848fdf/1606373011729/71613907484.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dc532e34347c7043ce2c/t/5fc8a422dcb5b26079809999/1606984739762/93035963635.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/86352140261.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce4a96de434d6c8f06c17f/t/5fd6a946034a586a4f4f2ce2/1607903559619/vopojiluzoridilasok.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b3906b97992eb5678c6c/t/5fce128be43f2b00a8cfdc31/1607340683399/english_reading_comprehension_worksheets_for_grade_5.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 1

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_off0000cf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6E 4440 bytes
SHA-256: 7d78efdc9947182f3e145c49a12c1809afa279e502e6ec351db24c1b8c65d586
font_01_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 11216 bytes
SHA-256: 1aefac3c98a75e80aeb568370f3fdcca52502fb6e0b7536909aa25a2d55e2049

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