Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce28354437240279…

MALICIOUS

PDF

78.9 KB Created: 2021-09-23 12:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff909aa2bf15f01a487fc0e738ab781d SHA-1: 038a41bb3538e5be690727a70d676dcaae6a013a SHA-256: ce2835443724027917ca912932e34fdd5248088941190d035e7b3213c3c3b0b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=us+government+senate PDF link annotation
    • https://semangkabiji.com/contents/files/limuluzun.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/55701501618.pdfIn PDF document text
    • http://specimport.by/files/files/romaxovixiwopagovamiguvi.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/10742156501.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/muwolidilo.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/kofejuduzetanixeruj.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614380d6b8dab---binanafax.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/91794574798.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/remewememepetiraba.pdfIn PDF document text
    • http://beril.cz/userfiles/file/1771406534.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/wapig.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/fovawuxora.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/nuvojuxil.pdfIn PDF document text
    • http://skncn.com/u/files/rowufofopevovupedezamaloz.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/4410594987.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/rerutojawuj.pdfIn PDF document text
    • https://oasis-travel.ro/files/14021756610.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/bipojixenebefiz.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/95324753094.pdfIn PDF document text
    • http://clingac.com/d/files/59002242493.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/94677021049.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/59512143812.pdfIn PDF document text
    • http://gewald.ru/content/Files/69093792222.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/19209799186144680fc210b.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/domenegalurovefareseru.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://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_off0000cfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 18032 bytes
SHA-256: 61e902efbe8e77d45fd3b6aaf3212a0cc2fbc423b0983480fc26d29f53637729
font_01_sfnt_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001167e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 10384 bytes
SHA-256: 397d95d14f7fdb8b72b8d1ae416bbc773f2a18d417397377381204bb0fee4fab

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