Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd9edd33de1bccc…

MALICIOUS

PDF

75.4 KB Created: 2021-09-10 03:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 453f7e832476571905f27e5aa8140c22 SHA-1: df1e556c609d49d349b1c0feb89c9150c3fb6f9c SHA-256: 1bd9edd33de1bccc8e413db9527db51330f8cc240623b4b0faf867367ddd6457
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The `wkhtmltopdf` authoring application is unusual for typical document content, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=iron+man+3+apk+download PDF link annotation
    • http://mazraeir.com/images/upload/files/gipisopasobafo.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/68000477351.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/63157328933.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/xulafetunut.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/pezuvubupepumanok.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/81565536505.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210903143514.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/wafedudiki.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/wuleto.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/fomadelimusi.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/kalodenedupizamaposoku.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/56344781051.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202197200288954.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/renepomirekox.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/wipaxewinarupewo.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/66112962997.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/kubariretiv.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/jejifemegodutibevizusos.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/45664614529.pdfIn PDF document text
    • http://csp.hu/editor_up/sepelelopitopijasubos.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/92308391739.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/73509991885.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/sikili.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/24222663833.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_off0000bdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC6 19480 bytes
SHA-256: c8232bc16aa1aba3a01e331a0de3f9585d1fd05715f7e005fe1a3db1734f4e8e
font_01_sfnt_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 10364 bytes
SHA-256: d873127f7d334065b516c5c2de1bea4165fe68df4526d8edd7bfb3e2664d741f
font_02_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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