Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6446508128d7db…

MALICIOUS

PDF

69.6 KB Created: 2021-02-11 09:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a13afeb0e1599ea56653a2680fad6546 SHA-1: a69fbb6ee3682b105051d3baea4bdb48bbe6de96 SHA-256: 5b6446508128d7dbc294d169bc5825973a7549215bd63f7c81829a71a12fc35a
124 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, with one pointing to 'baarspo.ru', which is flagged as a link farm on disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links and the 'utm_term' parameter suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9668

Heuristics 4

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://baarspo.ru/aws?utm_term=macys+bed+sheets+king PDF link annotation
    • https://sajijudid.weebly.com/uploads/1/3/5/3/135393685/6864438.pdfIn PDF document text
    • http://aycotoro0.xyz/snake_worm_offline_zone_io_apkd0s5y.pdfIn PDF document text
    • http://acgmgroup.ru/senozifojigejiuxlo8.pdfIn PDF document text
    • http://teleporttur.ru/retrograde_pyelogram_medical_definitionrvqsm.pdfIn PDF document text
    • http://demask.space/wodowomawakexws3g.pdfIn PDF document text
    • http://zokixofevuku.22web.org/71799747127.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/zodawanuror/audio_editor_cut_merge_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/63593179675.pdfIn PDF document text
    • http://sexikiti.epizy.com/brother_printer_utilities.pdfIn PDF document text
    • http://miripiwamaza.epizy.com/bosufapipotaxum.pdfIn PDF document text
    • http://gotutopaxedirek.epizy.com/dobeteralitetivarokeki.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/66435808446.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/lutudola.pdfIn PDF document text
    • http://taxisariwoboduz.epizy.com/bevifosulimaxobade.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/formulir_klaim_asuransi_kesehatan_axa_mandiri.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/dopizogu.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 5064 bytes
SHA-256: f9297412c97354fc5e04b987b1ddc53680a10ad7430a8a44426bf958fa4b4ab0

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