Malicious PDF — malware analysis report

Static analysis result for SHA-256 937a2c309df06aba…

MALICIOUS

PDF

75.3 KB Created: 2021-09-21 02:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dbc630bb73ee503ac9482eee0985ac1 SHA-1: f25cb00d1d372220ff8d558594469d2b2e504deb SHA-256: 937a2c309df06aba6e9b09bb2200c77982757be7aecff792022468c0615948fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to PDF files hosted on various domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/tovirefivig.pdf In PDF document text
    • http://dwornawodzie.pl/userfiles/file/bolutoxojozisokutepet.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/filatuzunejegesode.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/87167858412.pdfIn PDF document text
    • https://kokomanis.com/contents/files/zogod.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bagorazakexosivatuxarak.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/kexunelujizasodezulijumir.pdfIn PDF document text
    • https://rjpexport.com/files/seruvileregazub.pdfIn PDF document text
    • https://fratellifurloni.it/file/89954337388.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/17437009556.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/gokimejoweriradete.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/18519218364.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/nagenasat.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/tomusox.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/lolamobisobeviwewasinaku.pdfIn PDF document text
    • http://prompol.com/media/file/18218807563.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/83487969650.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/lixanusulefopipa.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137812856197---28872817488.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/mofefeze.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/61787998283.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/segebifesizevuridoteruj.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/88414567158.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/31727794118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tiger+simulator+unblockedPDF 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_off0000c3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 11008 bytes
SHA-256: 8af5701a399ebcc4f76434c74e1f1a456bf7bcf21d790cf83b212a48cb5d9bb7
font_02_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 16588 bytes
SHA-256: 83097219de7ea9a3bf869873f07b7af2651203c778486cfd611fc232b3573ffe

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