Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a83d634ee397dce…

MALICIOUS

PDF

68.1 KB Created: 2021-01-13 15:39:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7b367f516351d0d00aa1f89ad0f73c6b SHA-1: 181b3d1f847de5d2ffee84c6b01270195589f352 SHA-256: 8a83d634ee397dce97e132ebfd0384489cf4e4ab995fc5dc04a9a470d215f99e
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, contains references to 'Student of the year 2 torrent' and the authoring application 'wkhtmltopdf', suggesting a lure for potentially unwanted content. Numerous external URLs were extracted, with one pointing to 'trafffi.ru', indicating a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=student+of+the+year+2+torrent PDF link annotation
    • https://nokatumevizo.weebly.com/uploads/1/3/2/7/132740479/suvig.pdfIn PDF document text
    • https://site-1204117.mozfiles.com/files/1204117/temple_endless_jungle_run_oz_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/cjh3Udl/siberian_tiger_vs_grizzly_bear.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393034/normal_5ff5bc799d1e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5fd24a2a12f37.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/tizedeniluxiz-gefowigujotubu-senunomikale.pdfIn PDF document text
    • https://taninawaporo.weebly.com/uploads/1/3/4/3/134327975/03f5652.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/bajapovogam/video_music_awards_2019_performances.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/casio_g_shock_3230_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/mipumonurowosizo.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/business_plan_template_excel_uk.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_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 5120 bytes
SHA-256: dbca5b7ae1f81b6a1796c632c2a0341fc44cf619d2bf556d8867b996eec5cdc9
font_01_sfnt_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 10960 bytes
SHA-256: 9396aa74f88078e5105c032aa08082e11bf79cd6e6e94dc86cfe0b7256c97be9

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