Malicious PDF — malware analysis report

Static analysis result for SHA-256 1110cf904faa016a…

MALICIOUS

PDF

67.9 KB Created: 2021-09-29 13:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bd6e25d26d6cdfb2e9424c3789feba85 SHA-1: fa4100c346a150f88dbe0d47837e7183f4fa6fa2 SHA-256: 1110cf904faa016affb98c3a7765173faa5f6af95a103acb4d8f6b051fd4a643
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous embedded URLs pointing to potentially malicious domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the true destination or distribute malware. The presence of many unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://benetalent.com/upload/files/94662605147.pdf In PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/15294315576.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/dukofaxo.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/faturi.pdfIn PDF document text
    • https://medtek.vn/storage/file/gasurovolawafubigemi.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/86747161345.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/50897831507.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/71727086436.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311837e58e6---74298016371.pdfIn PDF document text
    • http://citra.cl/userfiles/file/37752983030.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/35588258606.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c73747d45f1857cdad2211491e88feea/nuzaxomurot.pdfIn PDF document text
    • https://pmms-online.com/assets/file/donumifidufejiwuxaz.pdfIn PDF document text
    • http://carbontuning.ru/file/jivop.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/92472901812.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/nusawubufodumejugenazotux.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109020856169906.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/26002912292.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/buzokegexa.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/70852962843.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/mawezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hotel+dusk+room+215+romPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAF5 10540 bytes
SHA-256: 5c3017bbc545b7863a56f639d807088a47b3fd0660b9d5c76c9bb773c7e68715
font_01_sfnt_off0000c326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC326 15092 bytes
SHA-256: b9d86c2d1838e263ba740e9f2b07c44beb3df6a2922d9c539b1ded37cf5ddd43
font_02_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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