Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ec6ebb10336e3b…

MALICIOUS

PDF

73.9 KB Created: 2020-12-21 08:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 967b0866ae3e71d17da2bda20547448b SHA-1: 617f5071bb016148efa1a62223013a38a6687d23 SHA-256: 40ec6ebb10336e3b3b16380aa714a3091bfe2bf916ab877d757bb51a3840fdab
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a carpet cleaner manual, likely to trick users into clicking the malicious links.

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
  • 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://ggtraff.ru/123?utm_term=bissell+proheat+2x+select+pet+carpet+cleaner+manual In PDF document text
    • https://vosokujegenukof.weebly.com/uploads/1/3/4/4/134474729/gafovabeg_laluzetozubibo_rasurinupazun_zinerawek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424647/normal_5fdff4ea426f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466664/normal_5fafd31a857d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5fd2e6f8521b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fad7d859926b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5f9ceae917c05.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/fa6a7be4-e5c8-4c36-b78e-350448cb6aa8/vefanisabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/674484a9-80db-4d93-9a48-355a4da4b182/lekunesodugusepebiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b66fc9a0-a11f-4300-9a36-d91761b81749/desalasarifajiturik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3541676-2aeb-4685-9c3f-32122399fd80/asus_sabertooth_990fx_r2.0_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba73dd3-126b-4238-9fad-1ec67f19d9b8/vaneseto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/375eb518-4fcf-4d1a-8a68-3994ede9e7fc/pathfinder_best_spells_by_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fdf0348-10d1-4db5-89a9-2dccf3f7d65b/dnd_3.5_players_handbook.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_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 5424 bytes
SHA-256: fceefba07d717bb183c7dfc83c3d22d8986be3f2fdca5797600ac5fc3c88cfa9
font_01_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 11596 bytes
SHA-256: 901e58de6c53bfadfa4d13a1f14efdf88c9571679261c3c2e1fb3a4b2da9321e

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