Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a84298e3de3a8a2…

MALICIOUS

PDF

69.0 KB Created: 2020-11-27 17:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ef5c6c9107d4f80295c5f39d214b5b9b SHA-1: d2b0f3af7ad7486a796a96ea681b3a4adf7b1d44 SHA-256: 8a84298e3de3a8a23f6de523459ade852838a7c5255ee17de76749c4f9bba386
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=the+exorcist+camaro+zl1 In PDF document text
    • https://bogovimageji.weebly.com/uploads/1/3/4/5/134509337/kazazojalegirut.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/e5051240-822e-401a-b330-d447a3312e3a/19833914779.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/beckhoff_plc_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e860aa9f-f0a7-4cb3-baa3-448b38712313/2750732907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca91c3ba-91c3-471e-862e-d0c20bc1459c/pabigikaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06259f9f-b219-467b-b7d4-bfc05d35f607/zunaxalitadaxujebamok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5279bd-23ad-4f88-8099-78d37d4f9cb0/totelejotodonepujizukam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc86ebe-aed8-4950-9745-2b6c41002a44/lajevuxaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe2a3bc-e40d-4331-b281-296420085623/nascla_exam_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/zappos_shoes_women_shoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e6384a6-008b-4db3-bb85-c113007754da/indksiyon_ocaklar_dkm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a13b867a-428b-4710-b1c6-f8707571903c/casio_fx_991ex_manual.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_off0000c2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BB 4840 bytes
SHA-256: 65026555601a39a6bafbfb73f34798fc45494b0465581736518af5fa720d1f71
font_01_sfnt_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 10720 bytes
SHA-256: df9c6c37eff9c9586b3af186c54a0f66ed3e81ddc097fbe30850c837de3be2a2
font_02_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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