Malicious PDF — malware analysis report

Static analysis result for SHA-256 183900ffa6af0a62…

MALICIOUS

PDF

75.3 KB Created: 2021-01-06 08:15:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dae96407ce3d366177b72503ce6abeab SHA-1: 75f07511d7506e443300f8216b653f043069bf4d SHA-256: 183900ffa6af0a620fb1cbf68932326baee04ce9b6092c13721b4169c1065c86
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on dynamic DNS services or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://traffset.ru/123?utm_term=bluebeam+takeoff+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426415/normal_5fdc281eea875.pdfIn PDF document text
    • https://gifogesedex.weebly.com/uploads/1/3/4/6/134625351/19bde2f6.pdfIn PDF document text
    • https://nilukosezaxed.weebly.com/uploads/1/3/0/8/130814529/koxag-jaboke-raroxep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444850/normal_5ff4eb1350d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_5fa04da829b1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471096/normal_5fe2dc7a38a70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375909/normal_5fe0cd8644db1.pdfIn PDF document text
    • https://cdn.sqhk.co/bomunerafoju/h17ijeg/88175068214.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450734/normal_5ff5278f22c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_5fc28c2c3d19a.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/kezelarevew.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/eW1jcgg/did_it_again_clean_10_hours.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/53b1e02f-ef5b-4f76-959f-2e1ddf484866/imprimir_un_arreglo_en_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f123da2-da47-4661-b539-3d5cc63172f3/dividing_decimals_by_whole_numbers_notes.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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 5036 bytes
SHA-256: cce9baf4b232e21a7ca6ffe583dcff8f8154414a0b363381316bb76e0606756f
font_01_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 10440 bytes
SHA-256: 8759432ba475cdd677e3133ad17006c95a278e24afec42f8b5197d9927af50ff
font_02_sfnt_off00011277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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