Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4acb698dc358479…

MALICIOUS

PDF

71.2 KB Created: 2020-12-07 23:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7a313a9a52ed05e6d8132835f8cf4ee9 SHA-1: d24db76834260a21e93ccef6e4f432f4280b76b7 SHA-256: b4acb698dc3584799d6423d065bfd877da62825704e21c61aa3fb4bbaaba88e7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, and it contains numerous external links, including one to 'trafftec.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a malicious intent to redirect users. The presence of these links points towards a phishing or malware distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafftec.ru/strik?utm_term=proper+boy+scout+salute PDF link annotation
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/lipexezasizolun-ranadojubijuwox-laferokivupobe-xotozinud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449405/normal_5fbee20eb6704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5fa5fa32693c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_5f8d7dcf573a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_5fac4c7cbeda6.pdfIn PDF document text
    • https://zugasunisozabij.weebly.com/uploads/1/3/4/7/134759734/7180578.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/53cba6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gewuwasi/difuxodolubukamako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3646fe9e-2610-4c57-bdbf-ece97da93dc9/50340748785.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/how_to_fill_train_reservation_form_online.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/atelier_ayesha_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57ef934-07df-48fa-9859-e0bddb6b2bf3/japav.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/city_of_toronto_bike_parking_guidelines.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_off0000ccc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC6 4896 bytes
SHA-256: d0a10114d2b367a1d28141a61176659f863ab7d5cc02670e86f851dbe94f35ee
font_01_sfnt_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 10748 bytes
SHA-256: 52a3cce98192c1d474d4dd7dfb1f6abff29f2918bdbc81af5b40ac1334a56bfb
font_02_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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