Malicious PDF — malware analysis report

Static analysis result for SHA-256 9219dd45c890d16d…

MALICIOUS

PDF

156.5 KB Created: 2021-04-08 03:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 10d85972378b3e38271c547c56f8557c SHA-1: 01461bd1e21fca4ed95e256f813eee5a3ef5f50e SHA-256: 9219dd45c890d16dcbd853bee2dee88d0239771ff8bf43bbef6e9df63460de17
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document presents itself as a BIOS download for a Dell Precision 490, but analysis reveals it is part of a link farm designed to redirect users to various potentially malicious sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=dell+precision+490+bios+download PDF link annotation
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/11e7e5d.pdfIn PDF document text
    • https://wixetaduzem.weebly.com/uploads/1/3/4/4/134471786/bewaw.pdfIn PDF document text
    • https://pemolopudamas.weebly.com/uploads/1/3/4/7/134753943/d15734587.pdfIn PDF document text
    • https://cdn.sqhk.co/suwuwewazaka/dhjiagh/77776032974.pdfIn PDF document text
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/tiravogenedomupolun.pdfIn PDF document text
    • https://xesevurodat.weebly.com/uploads/1/3/0/9/130968943/widukasa.pdfIn PDF document text
    • https://mezovojexojija.weebly.com/uploads/1/3/0/8/130874002/231a3e3b4.pdfIn PDF document text
    • https://narapafugoziror.weebly.com/uploads/1/3/0/7/130775848/6861995.pdfIn PDF document text
    • https://cdn.sqhk.co/lolatonuvesa/ge3hjeI/wig_master_app.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/1gdtTih/vatafopovitowakijiluxi.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/h3xgfjW/gevasuwoxezamovipegew.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/gdidbDq/4_pics_1_word_level_1829.pdfIn PDF document text
    • https://kasozufadoji.weebly.com/uploads/1/3/4/5/134523760/wevezusekumerod-sazikifavowi-mipame-nexubelinowudo.pdfIn PDF document text
    • https://cdn.sqhk.co/mixekuwuvo/ciiREgj/fatowunerifasifolok.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/vFgjhid/mililani_consolidated_theater_showtimes.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/mibiwivanetuj/what_questions_to_ask_a_technical_recruiter.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/5771472355.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/78802592115.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/68012794839.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/d-link_dir-825_ac1200_wifi_gigabit_router_review.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_off0002295d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2295D 5684 bytes
SHA-256: f435926bb646421e5b25fc1b731aff5b4de15f4142781f5e3e518c84a19961b6
font_01_sfnt_off00023cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CD7 10932 bytes
SHA-256: d8a9a997f6e176a70953ccb06653e261cb92e7169ba60514065a041e51de6903

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