Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93e19e30ddb591f…

MALICIOUS

PDF

77.1 KB Created: 2020-12-25 02:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3aefebe592c48cd319912caeb2b4cb8b SHA-1: 1960d31c1d3a8fefac26eb8ace0738b8813c101d SHA-256: a93e19e30ddb591ff71ad350e1c428a26805bf89c68dbb04c0bb11a44d74ca07
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm designed to direct users to potentially harmful content. The primary malicious URL identified is trafffe.ru. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/strik?utm_term=ms+pac+man+maze+madness+n64 PDF link annotation
    • https://julufima.weebly.com/uploads/1/3/4/8/134884845/1884247.pdfIn PDF document text
    • https://bogewugarut.weebly.com/uploads/1/3/1/4/131483108/4a3bd98fbdf5ae.pdfIn PDF document text
    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/bejevat-fenazeluruwu-zakodowij.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/e92b6fa1-fc58-4cac-b2fb-765d6ee61da7/15012290995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1fbe4e-9ec7-4ba2-a3b0-a923aa05ff24/60241205161.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/regafusigatifuniwusirugox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e8f603-4a86-4c1b-a447-3b16164b5a2f/komobizajabumigetatak.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/36237043191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ea6809-9107-4739-9fab-b558f5776fd0/espn_games_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9baaf9ee-4496-4229-848a-5fbd3f8745e1/hitmen_for_hire_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb66fc9e-d363-41bb-acf0-14749bb9ce86/49937725387.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 4100 bytes
SHA-256: 3677419a563cd59f42ef1c2a710a403decb3a12ad15b6d0b5b75d409b0d97b69
font_01_sfnt_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 4940 bytes
SHA-256: 062c706d375f29113d100560714426b4784d988c7b3c6449f6ab6a8b2419f56f
font_02_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 10444 bytes
SHA-256: ab8b08e215bdcdad4c3bd2c385ff2b00a73ee742374f3ddd8d4d996f5fc7411c
font_03_sfnt_off0001198a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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