Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4b3af8f8f51845…

MALICIOUS

PDF

66.7 KB Created: 2020-11-24 05:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 633cb60287b3f99ed8e13ebfcc808a83 SHA-1: 18958801b6b6c1a6bcd6475e925d09a96a639370 SHA-256: 8c4b3af8f8f51845e0462f6b9eeb930a076af55b63a8d8f046d88ab37df78799
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on directing users to 'trafffi.ru'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM', suggests a link farm or phishing attempt. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=it%2527s+always+sunny+in+philadelphia+script+submissions
    • https://cdn-cms.f-static.net/uploads/4417118/normal_5fa7be7367762.pdf
    • https://cdn-cms.f-static.net/uploads/4490534/normal_5fb7ae3ac62d5.pdf
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5f94512c0c1ef.pdf
    • https://cdn-cms.f-static.net/uploads/4380383/normal_5f8ebea5b8f21.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kirorafagosox.pdf
    • https://cdn-cms.f-static.net/uploads/4387826/normal_5f8ecc6c319ec.pdf
    • https://vamepuruzaf.weebly.com/uploads/1/3/4/3/134352512/zejazurivovofu_livimoji_kiful.pdf
    • https://merigufut.weebly.com/uploads/1/3/4/3/134357701/8c37c0775bafe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/95e9736a-a186-4437-bb57-222c95db074f/tiwalusazikapidi.pdf
    • https://uploads.strikinglycdn.com/files/69441553-93c3-4547-b5d7-dc00d3464064/75295553179.pdf
    • https://uploads.strikinglycdn.com/files/186a27b6-e4a1-49f2-b753-b3048b6ef7bf/68737251084.pdf
    • https://uploads.strikinglycdn.com/files/7df0cd89-2b2d-4ab7-9861-219466733c54/81049170566.pdf
    • https://uploads.strikinglycdn.com/files/151da5cf-1e97-4cce-ad51-868e03a17eff/bahnschrift_condensed_bold_font.pdf
    • https://s3.amazonaws.com/xazarujokemus/22992462641.pdf
    • https://uploads.strikinglycdn.com/files/0f61feb6-24a9-4ca3-83ff-6d7e6db38dac/xupetiligonom.pdf
    • https://s3.amazonaws.com/gurowozenupifi/18565095220.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5c9.bin
912d1a37d920afebd764775815f419d8dccfa76e8d101b60042ae3a8b1eef681
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C9 5616 bytes
font_01_sfnt_off0000d8d0.bin
4397d26d306ab74b9e5847691d04da5b1859ab5573f6f6e238e6810b2b89b167
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 10616 bytes