Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85a4f5afa42c50a…

MALICIOUS

PDF

72.1 KB Created: 2020-12-20 21:28:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 30dc20f90790ec358cffb9705b6239ad SHA-1: 771551bcb2df77b4ada00321b85d4572c0df5815 SHA-256: f85a4f5afa42c50a64010f15566dea0a44380e2b63b8d6cd3672c43e95d0cdc6
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a redirector and containing a large number of external links. The primary malicious link points to 'traffmen.ru', indicating a likely phishing or malware distribution campaign. No scripts were extracted, but the embedded links are the primary attack vector.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=claude+debussy+clair+de+lune+%2528as+heard+in+twilight%2529 In PDF document text
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/9036008.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/wedasutoxa_sigit_tonexexu.pdfIn PDF document text
    • https://wolofineso.weebly.com/uploads/1/3/4/5/134598063/kofoj-kejuji.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/9597161.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/3429230.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/sisaxu/rixofiwanagufubomoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1e5466-e51e-4be4-b376-6aa9b1090aa5/lobitodorivepa.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/66674267014.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/apk_minecraft_free_download_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee457caa-14e1-4e1d-8d7b-3390ac355e19/20630909339.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/tekikokiteg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ef4eb8-7ed6-4d74-938c-93063fae065b/xategomazadejigixowukilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369c22f4-e1af-472e-baaa-fe853d3386f0/11299535665.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/technical_interview_questions_for_ece_freshers_with_answers.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_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 5484 bytes
SHA-256: e2a6047cd2921781ff5489a969305a5fda6748b68aebeffc1fa55ef41d88551d
font_01_sfnt_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 11680 bytes
SHA-256: fe5a248c4208649389e284329e6eba681226c50ec79a159e298a91a0dfebcf4c
font_02_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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