Malicious PDF — malware analysis report

Static analysis result for SHA-256 198d09909f3d15cc…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 07:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16c85a574eed7fc0705d1253300e6152 SHA-1: 2d79f26291d13863179b5943fdc935beb30fa36c SHA-256: 198d09909f3d15cc823ac4e158c5ff05c5a26adb4e2da117ae10194854dd050a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning model and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and configured as a link farm, suggests an attempt to direct users to potentially harmful websites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose but reinforcing the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fabtur.ru/upload/files/58833303496.pdf In PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/5846u00kv1h2ev81kks83gioh3/85159194583.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16137e874eb8de---wuvovadiwibuxogevomon.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/mudunibitit.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/refofowudexo.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/86092982466.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/wewawozopuwupimeg.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/88825576530.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/fezukupotitemez.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/furuvagulazoxenip.pdfIn PDF document text
    • http://industra.sk/userfiles/file/nojojozederesu.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/ferojunosegigovatotado.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/1198250365.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/wuwebojofekararafini.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/27362057006.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/lifofofenujokadipiwokiro.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/pezikoxopefi.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/34480718773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=app+to+backup+android+phonePDF 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_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 10708 bytes
SHA-256: 59fdb2f819463a27b0328dcf90a15330f27420463f3541bfff61bc768070fc6f
font_02_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 17536 bytes
SHA-256: 08a3a92d863e51c860668530333e0567f20ade5cdf6b01864ca5fb3ae8174532

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