Malicious PDF — malware analysis report

Static analysis result for SHA-256 d039c3e401fb7b26…

MALICIOUS

PDF

69.5 KB Created: 2021-02-22 20:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 28dc0e50d7444498cf516e3a6d376f2f SHA-1: b1c9fe57f3cde792b091ee49511e4f208680682a SHA-256: d039c3e401fb7b264bfc58d239028addb2088df37feb630a2a34c9ac6e0edb5c
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://druttle.ru/wix?keyword=algebra+1+semester+1+final+exam+study+guide PDF link annotation
    • http://ingmijn.com/pioneer_deh-x1710ub_specsb5f46.pdfIn PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/vetakib.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/idCiahe/rugusavitosaxulej.pdfIn PDF document text
    • http://ig-copyrightnotice.com/30873856557i8js3.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/lhhmlhe/mikedaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_5fc7d66d4fc00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5fd1491331d44.pdfIn PDF document text
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/3138070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424007/normal_5ff34dbef4142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480899/normal_60059e99855c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464297/normal_5ff3298de7f70.pdfIn PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/ruzabidef-mizotupexi-risage-sakudo.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_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 5580 bytes
SHA-256: 6ba240ddbd95376bb2384e4e47c13f7358c335aad8d3745370db48c1b2fcc31e
font_01_sfnt_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 10180 bytes
SHA-256: 34d021c25dab49b9e29644490fe33d7f378176da75fee621427e1f5559adfb5d