Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6b377939bb9af9…

MALICIOUS

PDF

82.7 KB Created: 2021-01-01 11:32:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 49a2001a285cd30b985a6c8dda125d61 SHA-1: 04d756feee95afe9076afeae632411dbb46f138e SHA-256: 9c6b377939bb9af9145f67c53f72e633aa0cd153daff14ab87668908a57d4ff8
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to a suspicious domain 'trafffe.ru', suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_LINK_FARM heuristic further supports the attack pattern of using the document to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=stack+it+up+lyrics PDF link annotation
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/konekowinulatig_mulizuka.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/bbfea99a.pdfIn PDF document text
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/sazezurubimogulug.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/gd1NZGo/sky_roller_new_air_skating_game.pdfIn PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/0a846a040cf.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/bOnjbhj/amtrak_train_status_covid.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://uploads.strikinglycdn.com/files/ba85f82b-af6b-483d-a00a-4a943a082e9d/making_iron_ingots_in_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216e8d0b-1b34-4a50-b7bb-8f249c448eab/download_adobe_photoshop_cc_2015_full_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/23771961227.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/water_cycle_worksheet_with_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ad9322-5e60-4707-abf5-909c68a65ad5/47898168406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a11026-c199-45ed-8431-a4e7611b54a8/independent_novel_analysis.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_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 4744 bytes
SHA-256: 48c469c64dfb19641fa6062b5898b8957e0e15aac889ed9eb0d2165f3406b6a9
font_01_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 11248 bytes
SHA-256: e9edd137058faaa8605bd94d94d62de8afe141b54517148b5ddb85aa4d786e06
font_02_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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