Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7208951ac7756e…

MALICIOUS

PDF

89.6 KB Created: 2020-11-10 09:35:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 90e93a839818855a096827f35079c158 SHA-1: d9d24051dbdfcd6856e06adad1faab704e5f35df SHA-256: dc7208951ac7756ed5bf26c06be806e80069e91587b409ef468637dca14ffbc9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'traffking.ru', suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?keyword=handbook+of+biblical+chronology+finegan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5f961d39d9930.pdfIn PDF document text
    • https://babunugigexi.weebly.com/uploads/1/3/4/5/134582988/ludorov.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/nixozag.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/dowavelaxam/5131557912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6dfcc14-2ea8-47f4-9252-c957af5f7d25/finusaduxitelovaf.pdfIn PDF document text
    • https://s3.amazonaws.com/nujosuwemedadi/12683211369.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/andrew_jackson_cabinet.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/juxaxapenavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ddedbb-c8d4-4a35-b78c-78d0326ebf30/malayalam_novels.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/limosapudejona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ce01c6-8b8a-4c65-ae65-c73fdb6d3bfe/xoteti.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/prayer_for_depression_for_a_friend.pdfIn PDF document text
    • https://s3.amazonaws.com/tabagelufazafew/sombra_del_monte_es.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e900e0-e49a-4888-98f8-1c909461e3bd/kivasuwuwumuvata.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/brunner_and_suddarth_s_textbook_of_medical-_surgical_nursing_volume_2.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_off0000cfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB8 26940 bytes
SHA-256: 340ef93e297a2914fba0b24899f346aeb11f8f260b8271c70b13d4937b24c514
font_01_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 5372 bytes
SHA-256: 2167b72abe03d694b349a83fc9f1683e180593c0a2ed1d7184cf60d73ee3e1f5
font_02_sfnt_off000134b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 10740 bytes
SHA-256: 19168f3290b34a3ff6d8ef3114f798f84a615776d4a77b9348faaf8d374b958b

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