Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c64fca407e148a…

MALICIOUS

PDF

74.5 KB Created: 2020-12-25 02:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4af7348f2a849048abfa7c6a4c8fac56 SHA-1: 23a6e6c26a2ad1b9c878f9d367cf05013b0b134a SHA-256: 19c64fca407e148a15b21ad919cb8c80972a91a324792da121cc4e07ac9fea58
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm and ML classification flagging it as malicious. The presence of a URL pointing to 'trafffi.ru' with a 'mod apk' parameter suggests a phishing or malware distribution lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing users to open a password-protected archive, a common tactic to bypass security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/strik?utm_term=steel+and+flesh+mod+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469119/normal_5fdb19997b95f.pdfIn PDF document text
    • https://cdn.sqhk.co/lisojikefe/WmggYCf/zombieland_saga_season_2_release.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fc990e1cf929.pdfIn PDF document text
    • https://cdn.sqhk.co/titipubaduw/ghp7ogg/jelly_shift_game.pdfIn PDF document text
    • https://rakonudiboxenej.weebly.com/uploads/1/3/4/8/134874851/9974074.pdfIn PDF document text
    • https://bigogewoxof.weebly.com/uploads/1/3/0/7/130739615/5983176.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/8fca0c45-abe9-4c63-811e-7312b32a3e40/jujaxafivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef733240-d2d2-4eeb-b8ff-678356b47871/bixewexujadudarowekuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1c4df7-8a16-4658-a5d3-9be7c2b75008/8748440669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4cddeb-749d-483c-906e-d3274056d8ff/45919213357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d87292c9-edeb-4bd9-b7dc-af6f7e70cd63/labiva.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/sunderstone_gorge_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a4a9c1-539a-45af-b9ff-a754fd693c73/professional_transportation_inc_driver_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a18d9656-208d-43ea-9fab-e11fe20ec7af/57215370679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f71ac7-dd50-4fcc-b079-c906cf67747e/81431667262.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_off0000d805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 5092 bytes
SHA-256: 228a6598ccd4d294345e3da4c5f3798ae85672ffe6f11de72a3be39e2c404e47
font_01_sfnt_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 10704 bytes
SHA-256: d352d38a286c6f99a7f10abf9151d0538f46ca4821e4e8fafe7c17bff6e8269f
font_02_sfnt_off00010d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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