Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d011850380722db…

MALICIOUS

PDF

70.9 KB Created: 2021-01-01 19:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 914c62fc1bae4ff834c1d03f6e07e8a0 SHA-1: 15ef5d940dc9c4f2ab7c42c0b06a37e9b0121d5b SHA-256: 5d011850380722db102d1ce5e4ff9b9e6bca0c4921e29c5ea4b1c8a4aad9d16d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with a specific heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://trafffe.ru/strik?utm_term=gba+emulator+2+apkpure', which is likely used to redirect users to malicious content. The presence of embedded JavaScript, though not fully detailed, suggests potential for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/strik?utm_term=gba+emulator+2+apkpure PDF link annotation
    • https://xevulejokidowi.weebly.com/uploads/1/3/4/6/134680820/d10675.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/aliiegi/15674844305.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/0e338fa0eb7a.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/AtFjdwY/looper_jamman_stereo.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/d565ace6-75b6-4e03-9191-83dd1931e91a/serena_sailor_moon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc8e0dc-f60e-4006-926b-6c09031cffaa/les_pieds_sals_gurande.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7858ce13-b5ae-4afe-b5ba-e916df4c71f0/gukaderaxexugazemet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8149657-27e3-4e7e-b872-c6c00235760f/liligujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2dc77c5-6293-47d5-b8b3-0a791706f299/55370758527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8ad9e2-954a-4753-9bee-adc19edf52d2/48713791088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f296075e-549b-4d00-b09b-95d49974dc07/62345759070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13521fa8-93b5-4eac-9aa0-64485c0f506f/jixidivuwalikofokezovore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e48a5dc-9d6e-4d0b-91ac-b0433bc62ae3/14143675658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7dea581-c4f0-47ae-b69c-5f7baec2a896/vanolunigojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a32dc94-969d-4eff-951f-bf4df7a1ea23/24429304147.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 5156 bytes
SHA-256: 78e288afbbe70fad04b1039a24f6999d6fb3c39cdf7be769f20061b01ac86c53
font_01_sfnt_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 3212 bytes
SHA-256: e5b907bcb86243ddbea4da680b87145457b6f545003c263af6b8998c90b90c02
font_02_sfnt_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 11240 bytes
SHA-256: ca6b39c72ced7541f3b1fe596be453b5c241b421df5eedd4eb4af49e8fc9abdb

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