Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3a0aa1712ff749…

MALICIOUS

PDF

85.7 KB Created: 2021-05-02 22:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac310da301acc649edc85b03dddc3d54 SHA-1: 67af1a7d5c5b9e09d2a4c04d313c39cb000c450d SHA-256: 8d3a0aa1712ff74960fbb61c61a18b8ffea453ba08622ccdaecbb771c0a5394a
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains multiple embedded URLs, with the primary one being https://crophysi.ru/strik. The document body is heavily obfuscated but contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/strik?utm_term=ejemplo+de+dialogo
    • http://oneplusonemain.xyz/pavolelobafosipaudz6c.pdf
    • https://cdn.sqhk.co/tipusuzog/nhJnmiy/80706389698.pdf
    • http://logmeinnow.xyz/nemidiwitezesemepulupzp.pdf
    • http://igme.site/564808744765d69m.pdf
    • https://cdn.sqhk.co/zodozane/BADihTu/puvotugidelegenoverivut.pdf
    • http://rrrrkkkkk.space/22240118052qxil6.pdf
    • https://cdn.sqhk.co/bavomizobe/ifhfjUU/pajesufazetaketeruvitese.pdf
    • https://cdn.sqhk.co/lozuzupadis/MjhignR/86005531522.pdf
    • https://cdn.sqhk.co/manigonodapu/gcUjb8p/21391343588.pdf
    • http://makamar.tech/63830387334irmtr.pdf
    • http://domavera.ru/manual_recliner_armchairlq2fg.pdf
    • https://cdn.sqhk.co/pijuvedozuw/haIijbj/black_screen_background_iphone.pdf
    • https://cdn.sqhk.co/zubavagi/gdhgkgj/wasetamutali.pdf
    • https://cdn.sqhk.co/xedaberetaj/fihhhhe/princess_dress_up_games_no_download.pdf
    • https://cdn.sqhk.co/vavewiminiv/jgihBhg/listen_to_tennessee_titans_game_live.pdf
    • http://lighterusb24.site/ice_hockey_goalie_equipment_cost1u40t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pafiganovavi/84847072266.pdf
    • https://s3.amazonaws.com/nojemi/gopepotepixaji.pdf
    • https://s3.amazonaws.com/metubevozisul/fezutuluxidixogomipoj.pdf
    • https://s3.amazonaws.com/midaguvimabof/40734647623.pdf
    • https://s3.amazonaws.com/fizufapu/lakepinuzajosotikake.pdf
    • https://s3.amazonaws.com/metubevozisul/what_food_builds_mucus.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011023.bin
120e448979a5b9b3c67240967a80de47fc8decaec733369b3872bce6ae29d40a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 5036 bytes
font_01_sfnt_off0001213a.bin
899b146dec1ae00a40a7756353c5301c8c2c620a3a9a73a28bcdbf8a982f5013
pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 12228 bytes