Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e8fb755dd362f0…

MALICIOUS

PDF

83.9 KB Created: 2021-03-20 03:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 00fdc5eb7f0e43a6a3219dd31ef63b10 SHA-1: 86c989350df155d46ecf275f767c3e2506d4fd17 SHA-256: 43e8fb755dd362f021540e496bdf34382ed11b01ab06714314f80af118bd4e84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/123?utm_term=performance+quarter+horses+for+sale+colorado PDF link annotation
    • https://cdn.sqhk.co/lekusovu/cThiDwL/22080630881.pdfIn PDF document text
    • http://kutalevewomem.22web.org/comptia_security_plus_sy0-_501_study_guide.pdfIn PDF document text
    • http://dorugatutaxovi.scienceontheweb.net/riripitufosigif.pdfIn PDF document text
    • http://xemakaze.mywebcommunity.org/encyclopedia_philosophy.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/xevubo.pdfIn PDF document text
    • http://xeweralimipugiv.iblogger.org/zewuri.pdfIn PDF document text
    • https://cdn.sqhk.co/wazewiput/FgegWgf/tolupajet.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/jh3yiew/redux.pdfIn PDF document text
    • https://silemixijotin.weebly.com/uploads/1/3/4/4/134463531/xirisasuju.pdfIn PDF document text
    • http://sepozimog.scienceontheweb.net/puvowo.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/ghhJoyO/76654834813.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/EJeibnb/fowopusinukeletam.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/9q5jg8t/21623696939.pdfIn PDF document text
    • http://jakivuxevova.22web.org/palimadabitexusokuw.pdfIn PDF document text
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/9639159.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/4204658.pdfIn PDF document text
    • https://rakurewirusemew.weebly.com/uploads/1/3/4/0/134017151/mufomora_relojatu_modupofisek_gidopepumisopir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikafivivuma.epizy.com/wugam.pdfIn PDF document text
    • http://valebuwevunav.epizy.com/sf_holding_annual_report_2017.pdfIn PDF document text
    • http://mizetum.onlinewebshop.net/33978069857.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/tomelivuzusuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/42820581322.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/21897550406.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_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 5388 bytes
SHA-256: 9e857ff8223b962531318dafe1df605809d148a1edf184aa923d1ed0e493a526
font_01_sfnt_off00011a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 11536 bytes
SHA-256: c20e17d90c8c5ea2042e373a823d528066ed77c21ede2d11da061752b9e093b9

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