Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45876677596ca37…

MALICIOUS

PDF

78.9 KB Created: 2021-01-15 04:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 997ac7379f3ff9f5f3aa7ce3fb407b50 SHA-1: dad26b818b077aa81630e59982143825655b4104 SHA-256: e45876677596ca379d66fd634c34dece70db247f05641951e5ed2784563c4d56
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://trafftec.ru/aws?utm_term=asian+games+2018+day+12+india+performance PDF link annotation
    • https://cdn.sqhk.co/bodovukig/W7oqVjf/stickman_tennis_apk_uptodown.pdfIn PDF document text
    • https://site-1203080.mozfiles.com/files/1203080/26461809771.pdfIn PDF document text
    • https://site-1175669.mozfiles.com/files/1175669/sojivumosobamavufubunuxaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5fa2a281ac427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373281/normal_5fff50dc66cd6.pdfIn PDF document text
    • https://site-1245158.mozfiles.com/files/1245158/manual_del_usuario_chevrolet_aveo_2011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5fdf57a858033.pdfIn PDF document text
    • https://site-1177347.mozfiles.com/files/1177347/exion_hill_racing_mod_apk_happymod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470035/normal_5fdec94c73155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_5f9f5e594ab6e.pdfIn PDF document text
    • https://site-1176864.mozfiles.com/files/1176864/music_and_arts_horsham.pdfIn PDF document text
    • https://site-1228702.mozfiles.com/files/1228702/verubof.pdfIn PDF document text
    • https://site-1177111.mozfiles.com/files/1177111/balu_abcdefg_telugu_movie_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/Zicibdl/sovosapamiwirowivix.pdfIn PDF document text
    • https://site-1178687.mozfiles.com/files/1178687/utorrent_free_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 6056 bytes
SHA-256: 681de787299dd0228981250c00701144a85a470fea16f97ef556ce62990e4e48
font_01_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 10732 bytes
SHA-256: af3f2060a92bddfd42018e0f0b92421e20f695fe39fcc82441abb7a676d28666

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