Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f61565d488e984b…

MALICIOUS

PDF

60.0 KB Created: 2020-12-24 07:01:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c50fcbf8fb6bc9e4c1846900136b77f3 SHA-1: d1b89852994707bac2fb8a0ba856683cdc665b53 SHA-256: 0f61565d488e984bf83568543182a7170141fdf8b2242c1ea88c88002ddb27b3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, with a critical heuristic detecting a large number of external PDF links. One of the primary external links, 'https://trafffi.ru/aws?utm_term=best+ethiopian+music', and a link from the detected link farm, 'https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/e0d9027.pdf', are included as IOCs. The presence of embedded PDF link farms suggests an attempt to manipulate search engine results or distribute further malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=best+ethiopian+music PDF link annotation
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/e0d9027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471704/normal_5fc8cec72f3c0.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/wuzeniwefe.pdfIn PDF document text
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/aefa28524db52.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/f06c22a9-8ea0-4e05-b7a3-840e059f8252/feg_pa_63_magazine.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/nugujufapakefavabepetu.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/spinal_arteriovenous_malformation_mri.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/vawepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebdf1aac-4913-4692-aa9a-9b44d3b92b47/juxijexasusorofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8375b56-236c-4419-8e1b-c912667c2841/8916562289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a15ffc-4ae2-4b0c-971e-bbef3397c598/unicorn_attack_evolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af5b0a3-044c-446d-a43c-0a801ee8d102/dadaxojininaliberatunowo.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/39715910549.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_off0000b240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB240 5096 bytes
SHA-256: 3a25b53ffa6c7cba3dcf41a4088c8de2b52797ee32f1c629b321b96e477e09e2
font_01_sfnt_off0000c371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC371 9608 bytes
SHA-256: eaaa17141c90be33f6d927bb140d93928baaf196e89bd02ac7bb648d9210823c

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