Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e59cf711dc0475…

MALICIOUS

PDF

75.9 KB Created: 2021-01-11 17:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1cd4f4b866152d56f1dbe019d1f75236 SHA-1: e408a2a2406706ad88a5babeea092d5e04e483b7 SHA-256: 90e59cf711dc047565c05d4708073d3dfe00c6691e0adbc2ec2b521e97d2f78e
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to PDF files, suggesting a link farm for SEO manipulation or to host malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely directs users to download a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://traffking.ru/aws?utm_term=free+kaspersky+antivirus+with+licence+key PDF link annotation
    • https://site-1172602.mozfiles.com/files/1172602/xofefukova.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/SWnjeKv/buvipipekovoj.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/h7ggcyp/bb_racing_unlimited_game_download.pdfIn PDF document text
    • https://site-1178670.mozfiles.com/files/1178670/86178340643.pdfIn PDF document text
    • https://korisupugi.weebly.com/uploads/1/3/5/3/135308649/kodebefupojavupun.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/wirexanusir.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/tetazino/22391364903.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/historia_de_las_brujas_de_salem.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/kuvikusi.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/fofamusifojorejuxalif.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/52248241597.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/how_to_format_lenovo_laptop_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/analytical_method_validation_interview_questions.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
    • https://www.kaspersky.com/free-antivirusIn 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_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 5292 bytes
SHA-256: d2733fc9cd4154e1371d2f7317e1937b06fa2f29360160ff814e5dde59af0075
font_01_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 11224 bytes
SHA-256: fafcb0db660e9e67b490b5ee023d13ac8245a43e13718af7a9f499dd9994c698

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