Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89583c001730a0a…

MALICIOUS

PDF

74.1 KB Created: 2021-01-13 20:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 11cf2371b2cb391c3cc21cd8851ab803 SHA-1: ba0888a1573672177e373cd87733d4bec3305dba SHA-256: c89583c001730a0aa1a1da2477a4333cd8999d9647fe1e196f440ed9344f9648
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing users to 'trafffe.ru' which is flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, many on disposable domains, to obscure its malicious intent. The ML classifier and ClamAV detection strongly suggest malicious content, likely phishing or malware distribution.

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 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
  • 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/123?utm_term=gta+san+andrea+apk PDF link annotation
    • https://site-1228702.mozfiles.com/files/1228702/yahoo_finance_python_balance_sheet.pdfIn PDF document text
    • https://site-1181037.mozfiles.com/files/1181037/viridiana_name_popularity.pdfIn PDF document text
    • https://vogapixafaroge.weebly.com/uploads/1/3/4/2/134234717/luriti.pdfIn PDF document text
    • https://site-1178505.mozfiles.com/files/1178505/star_wars_dice_meaning.pdfIn PDF document text
    • https://site-1233197.mozfiles.com/files/1233197/24460364822.pdfIn PDF document text
    • https://site-1207676.mozfiles.com/files/1207676/8292600339.pdfIn PDF document text
    • https://site-1176114.mozfiles.com/files/1176114/verizon_cellular_plus_gillette_wy.pdfIn PDF document text
    • https://site-1176165.mozfiles.com/files/1176165/list_of_all_boy_bands_in_the_90s.pdfIn PDF document text
    • https://site-1172223.mozfiles.com/files/1172223/how_to_draw_anime_boy_hair_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/wemerofada/B7vhcZu/umc_lubbock_covid_testing.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/tutapaxi/32382477387.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/revenge_of_meta_knight_walkthrough.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/mirunaxofazo.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/bulandi_film_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/63073911646.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 5016 bytes
SHA-256: 400a256ff11b650cbcd6139b76b33c2a7c31d32bceb61f8751fe043aee80db1a
font_01_sfnt_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 10592 bytes
SHA-256: 141cf21544a41303a46098301a38e2e7ccde033b0cb6f6a37408234af6b5a3c6

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