Malicious PDF — malware analysis report

Static analysis result for SHA-256 398f13ebfdd0c35e…

MALICIOUS

PDF

68.1 KB Created: 2020-11-13 13:39:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f6f4aaa8d0ab6d66e08c131848cd5673 SHA-1: 9bd6274d44c66f9e591cde3d52304f4bbd360bcf SHA-256: 398f13ebfdd0c35e68a17c7210624b0c301319eda213f36e43a75336bc85d995
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://trafftec.ru/strik?utm_term=activity+guide+-+bytes+and+file+size', is directly embedded and likely serves as the primary lure. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware delivery.

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://trafftec.ru/strik?utm_term=activity+guide+-+bytes+and+file+size PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5fae4753b90c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_5fac2ea07257b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_5f98194f8dca8.pdfIn PDF document text
    • https://timonuwek.weebly.com/uploads/1/3/4/3/134383578/jedosibusizava-ribadaxu-ruvijaxoxep-bazanelorodewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_5fac0106cd2dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5fa0164a30df7.pdfIn PDF document text
    • https://turetajonu.weebly.com/uploads/1/3/4/6/134629909/a71fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_5fa2ef8026363.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/29d3322d-f10f-43d2-9a7e-64c2645953b3/xerowewakadaxibibewumakuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287a1c73-e41c-484e-b28a-fb1ed564da85/spore_patch_5.1_steam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbaa7cfe-65dc-4e5c-a9b7-93dc5e3dac8b/wamirivenoxujuxetemex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8c638f-9c84-4587-b317-aa6b90508422/wings_of_fire_the_dragonet_prophecy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f74f424-aeb4-435a-aa56-cca4347dbeaa/47526716424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b53589c-887c-4d2d-af12-c422aafdbe6e/84441752218.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_off0000cbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCD 5468 bytes
SHA-256: 2ad1dff09dce2663efeccfdd676d95bf04022fdbb23bd0ce2a90310a1f2f3b4c
font_01_sfnt_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 10808 bytes
SHA-256: 3ea9a35bc8817d7c056fa03db7db8680943ff1bae492fe5582e39f22cce2ca87

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