Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf1b12bf2de89f3…

MALICIOUS

PDF

58.4 KB Created: 2020-11-11 22:14:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 88765af3e9a2ab63dec7c4e9188271ef SHA-1: 1df783274d1e56e3e5945865d2fd133cd1c730aa SHA-256: dcf1b12bf2de89f380015286d4d4ed1edcbfb0f4706a49885a9518719be28bc6
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, appears to reference a crossword puzzle, suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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/aws?utm_term=make+ashamed+crossword+answer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5f877f968f370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_5fa9e1e743339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5f89eb4fd4212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379034/normal_5f9535e605a26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_5f8cc3355183e.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/69246adf-980c-4b6a-9f07-d2ee9d73c241/la_crosse_wwvb_atomic_clock_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2d048f-4024-4eb6-994a-f654aa58dd68/pivivamoxunodutono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c79145-47a0-4588-9a21-1c83d0f90119/bavuzetijesifavipemugede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc12c415-5bc9-4281-84ef-2e7f4e3cbe5b/fikurazisumawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2127a6d-d6bf-4a4c-98c0-b43491c5e013/lolet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221f0b59-2bf1-4292-8be7-0a6aaee735a9/post_baccalaureate_programs_columbia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/100220fe-9280-403d-bf91-40f52b49e896/86994650420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/584c8af9-5ac3-49f4-93fa-3c98ae703a47/pijupijizirawomoz.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/waves_physics_book.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_off0000aa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA80 5308 bytes
SHA-256: 6f03abbb554dc9ddb1a4f9d2f1de39a1c7e7c6ae9718d9a723f85edee7f5e93c
font_01_sfnt_off0000bc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7D 9580 bytes
SHA-256: c57da140023185a457cdad883b863c3ff8be0d1b5c53a1a827dfbd34f07def73

Open this report in the interactive analyzer, or submit your own file for analysis.