Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e4a140b019835c…

MALICIOUS

PDF

108.7 KB Created: 2020-12-20 00:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9a5592da2d6d9e74943e63164dde0751 SHA-1: 748dd9729424e4563f8e761b03063c92c268b491 SHA-256: 77e4a140b019835c931c810e2f02952fca604a34b48d92f1dd8faf3232b3c44e
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URL pointing to a suspicious domain, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely attempting to trick the user into downloading or executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/strik?utm_term=anet+a8+upgrade+firmware PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409411/normal_5fb50e9b010ca.pdfIn PDF document text
    • https://xabisipejerifo.weebly.com/uploads/1/3/4/6/134634854/a9c7d4.pdfIn PDF document text
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/5947825.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/kalufizefem/2nd_amendment_pros_and_cons_chart.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf23c8cb11b25c09ae6ce/1606218300493/boron_nitride_molecular_orbital_diagram.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd13a2f7819f6264dcd7fd/1606226850970/woziraz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea89c44-08e4-4c19-8531-721afce2ef8f/irregular_yo_verbs_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/laboratory_report_18_joint_structure_and_movements.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/77629053663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2420e6f-11eb-42ae-93b8-e8d25abdd25b/bofirovilemiwubojuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47380707-0d93-40e3-94ff-f1db91ad2e7b/93085197911.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/kufidekaxo.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_off00016817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16817 5424 bytes
SHA-256: 6fefd2533b5cd0a49fc1ca78b2412e9a51c884be77e2e7751d141bc0528a743c
font_01_sfnt_off00017a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A86 13828 bytes
SHA-256: 38b78e8770b2af6d6b8fd87bc6d8df204217e7596bcd650db71f3c76f27cb5c9

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