Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdb3e200ab90a2a…

MALICIOUS

PDF

76.4 KB Created: 2021-04-07 05:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 12827e0c8c402ad8e13f2deebba2ef62 SHA-1: 7120be6143b4f3fd615be182a3e6de800ec1c28d SHA-256: bfdb3e200ab90a2a7a4cd225774cc77111a8b1cf8d2561e18d67da9568c676f0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', and the presence of external URIs and a link farm heuristic points towards an attempt to redirect users to malicious content.

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://bologen.ru/strik?utm_term=blade+inductrix+fpv+drone PDF link annotation
    • https://revuduxaj.weebly.com/uploads/1/3/5/3/135333309/xikitilozil_tuxaguniwovoma.pdfIn PDF document text
    • http://fastpeysistem.online/fofebogekijudesibazewgf331.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/abraham_lincoln_biography_kid_friendly.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/wadovopadosabodiwoxat2fv0.pdfIn PDF document text
    • http://vobasexukux.iblogger.org/tuxuveno.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/relative_clauses_rewrite_exercises.pdfIn PDF document text
    • https://gojajegu.weebly.com/uploads/1/3/6/0/136050346/rakugeg_tisumodaxuvekef_nifonifunam.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/navy_special_duty_pay_chart.pdfIn PDF document text
    • http://wukuname.mypressonline.com/patewunotafubokejogabapu.pdfIn PDF document text
    • http://selolaz.66ghz.com/27031017647.pdfIn PDF document text
    • https://lukobuguw.weebly.com/uploads/1/3/5/3/135396798/punaranisexo_wobez_zesipeweju_buzav.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/wovisak/ziginepal.pdfIn PDF document text
    • http://feluwagosipo.rf.gd/how_to_replace_batteries_on_honeywell_chronotherm_iii.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/41553264886.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/jodevezajobopune.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_9c59644576dc4f6e8ceceb0659811fe8.pdf?index=trueIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_277e6373dc674951abd89c0c7332746f.pdf?index=trueIn PDF document text
    • http://sasotogatajuxiw.rf.gd/lanebedaxese.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_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 5148 bytes
SHA-256: 1b8077e0bd0021b07a8c92878e461aefd035cdd9a309f91496f0cc917d4bdc30
font_01_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 11148 bytes
SHA-256: 68730b1f8c8e60777ade4f0c37dd5e173bcba3f902641ffde623d76b1db60387

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