Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf4c04ba2e11126…

MALICIOUS

PDF

64.1 KB Created: 2020-12-29 23:01:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bed16bd463b48ca8b13d3604fa72656b SHA-1: b4fd7cb13613fbd7a8874e660fc8b194e40a42cf SHA-256: bcf4c04ba2e11126ba8a63fc6d7a7fca69e62d6ba78cf77718ada55f64ecee90
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the PDF structure and embedded URLs point to an attempt to lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=blood+pressure+ranges+by+age+chart In PDF document text
    • https://rogubadivuna.weebly.com/uploads/1/3/4/3/134337887/lopumimalagujujabu.pdfIn PDF document text
    • https://rutobugexamaxip.weebly.com/uploads/1/3/4/5/134508198/fozidup_mifetune_wotuw.pdfIn PDF document text
    • https://vepaxanejabag.weebly.com/uploads/1/3/4/3/134317352/6211611.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/zolopetadivo_gatudavolufeg.pdfIn PDF document text
    • https://kexekogu.weebly.com/uploads/1/3/1/3/131384418/winovez_nimesuzivukik.pdfIn PDF document text
    • https://bajewenizuku.weebly.com/uploads/1/3/4/4/134475359/favav-vutositig-mitixezinaroxi-tirufunosafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8522eb1-3630-4ef4-8932-5272c41a1ffe/putudunate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a3061c-c3c0-4b4e-ac14-3d46029f8487/xajasoxaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b43f47a-be52-46ae-8cd6-ff759caaabf9/94659363547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeebaa45-0747-4973-bc52-66beb80b969c/que__bilbo.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_off0000bf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1F 5624 bytes
SHA-256: e9c8ec7571f6e4fe0986ca5e74fc5c2fe500f5110b307bf7247e68f37477467a
font_01_sfnt_off0000d23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 10008 bytes
SHA-256: bc62d8a27637235e5dd74affab25f87bab25037cca1c794c77ac0bceda40e72e

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