Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffa83644c38ba30…

MALICIOUS

PDF

67.2 KB Created: 2020-11-19 11:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed6776e718547bb813774d8f4ef79000 SHA-1: 6cf30fd847ffe07d4d2624589aa1b74c97ca7854 SHA-256: 4ffa83644c38ba30fd68895a5f3d55dbebcd2b5e0192b5ee3f081b06870bd89f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://trafffi.ru/123?utm_term=how+to+draw+comics+the+marvel+way+video
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/4514735.pdf
    • https://xogaketur.weebly.com/uploads/1/3/4/5/134593565/bipoloxakixupo.pdf
    • https://valekide.weebly.com/uploads/1/3/4/5/134584612/90d095.pdf
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8c3f11ed.pdf
    • https://vigakamodibit.weebly.com/uploads/1/3/4/7/134770941/rakoxaxojatopi_gukifutadegu.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/budup_muruketika_befusijago.pdf
    • https://jixiriramoke.weebly.com/uploads/1/3/4/3/134320492/7064855.pdf
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/mivetakeda.pdf
    • https://fujidefabez.weebly.com/uploads/1/3/4/5/134512048/3ca5987.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/39fda77c-7517-4d76-9e9e-429a3759ff26/4141793839.pdf
    • https://s3.amazonaws.com/tesapibebujep/tarekuzadasezamesu.pdf
    • https://s3.amazonaws.com/jezaxojipevu/citation_machine.net_apa.pdf
    • https://uploads.strikinglycdn.com/files/47433e8f-ca8e-4e80-9cd4-a694d3d8272d/74460668370.pdf
    • https://s3.amazonaws.com/mesixadelomomo/remote_control_cars_for_kids.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd9b.bin
c12713d4959d6983a7dc371ae2149473ce2c32db5608e1d8a17ffb31177b5417		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9B 5392 bytes
font_01_sfnt_off0000cfd6.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD6 3720 bytes
font_02_sfnt_off0000db39.bin
41e7ca33847c5f584d1b73b595382815dbd1cd11484bcaff284b92380f27c418		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 10660 bytes

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