Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f42705bc80c56e…

MALICIOUS

PDF

66.1 KB Created: 2021-01-06 10:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ee14e7bc102daad344185388d671ad22 SHA-1: ed57f8121ed23208aad2d2634780e30b46f8ae15 SHA-256: 84f42705bc80c56e0883cd5d4a7d774ae4628003ea714b184d3c092afdb1123e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, directing users to various PDF files hosted on external services. This behavior, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution campaign. The presence of embedded URLs and the ML classifier output further support the malicious classification.

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/aws?utm_term=full+screen+video+songs+free PDF link annotation
    • https://pujawemufupu.weebly.com/uploads/1/3/2/6/132680931/kefenubudu.pdfIn PDF document text
    • https://milunuxuv.weebly.com/uploads/1/3/4/5/134529922/gofogetosevuwuvipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5fa8c6db8b50b.pdfIn PDF document text
    • https://lolozodosut.weebly.com/uploads/1/3/1/6/131606575/8327694.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/hgH8jie/vegas_slot_machines_casino.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/j6459jj/zexedonidikugom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeponodij/mercedes_c_class_estate_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e2ad341-518d-4cf6-b4e0-de9938712f78/26156843327.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/saxolepujumiwoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1e4767-4a68-4467-b72e-927f4d77dceb/39345343331.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/76966502908.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/16263191157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1e0bfa-0287-44ee-9800-84dbf4ac13e2/death_in_the_clouds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4fe681-69d7-4478-bcc2-368e68669d05/bill_burden_elementary_liberty_hill_tx.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/stay_hungry_stay_foolish_rashmi_bansal.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_off0000c453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC453 4996 bytes
SHA-256: 9c75224fa1de013af9e49c67b366760ed52609410a92c67bed6b8923dd5bfb96
font_01_sfnt_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 11376 bytes
SHA-256: edf2ed2707b9dfb6061be8995f21e100f05843d40d6c6f913c0cc1dd65153846

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