Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b3139df5a68eea…

MALICIOUS

PDF

93.1 KB Created: 2020-12-24 18:54:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ef50117bf3d8b8da827a002f180fda62 SHA-1: ec227100c788c92efcc1cd419170641df4459bf2 SHA-256: c1b3139df5a68eea467c664a4a1cf69602257c65df1873b9132fee9d9b579d20
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to a suspicious URL 'https://trafffe.ru/strik?utm_term=red+warrior+level+9', suggesting a phishing or scam attempt. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' further supports the attack pattern of using a link farm to direct users to potentially harmful sites.

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
  • 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=red+warrior+level+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f8728e309d0e.pdfIn PDF document text
    • https://fikupekuxugo.weebly.com/uploads/1/3/4/6/134612485/57676245c74f95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_5fd1e043e9ff8.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/8b4d0.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/bezutu/dulidudoki.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/behavioral_finance_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/fonuwudekak.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/call_of_duty_infinite_warfare_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f599654-7722-4abf-927a-21deb578c3a5/god_of_war_cheats_valkyrie.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/14239014972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/076ea164-29d3-4f60-bb10-95bf9945e0ab/fly-by-night_meaning_etymology.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/calaveritas_literarias_escolares.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/zofibiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35465410-0133-4697-95af-cd5f5300e6de/kobigigizewewar.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 4956 bytes
SHA-256: e7f9c11df5ea7e47266841fa492e71ba9adfe2e923dc795550f73d3639b66a15
font_01_sfnt_off00012ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA0 11340 bytes
SHA-256: 2ed005145f699ce6c15b07399f8d8289b77363c1e43ae384a1fef96496c75685
font_02_sfnt_off00015280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15280 16092 bytes
SHA-256: 2df61256b45890953c2308fcc748029de317a0a793b02a6ed06bd2a8a3367127

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