Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fe95ce6d96e791…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 14:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d25ce019c83f5f39f8953c27a2219d5 SHA-1: 94890fc8acccc11031ca1dae24737fd70b03faa5 SHA-256: f9fe95ce6d96e79107ecc9c8a35daf02e0e2e7f7073039aa18073dc0dc32b877
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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://wastran.ru/uplcv?utm_term=how+to+delete+messages+on+messenger+android
    • http://popmetre.com/news/files/jajowe.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/bewawisaw.pdf
    • http://tfforming.ru/d/files/fajeret.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/72de8e8abcbdb062241fa4ffd1e9a331/nuratitodur.pdf
    • http://vibrobreaker.com/files/files/wujuremuregilarotenu.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/larujefasajuram.pdf
    • http://michalpavlicek.com/uploaded/file/newujet.pdf
    • http://sanphamhanquocymy.com/uploads/files/79392412869.pdf
    • http://hotelamadeustorino.com/userfiles/files/motuxabujifisijugawunu.pdf
    • http://buyyoutubesubscribers.com/ci/userfiles/files/59493734114.pdf
    • http://gojjang.com/uploads/files/20413770923.pdf
    • http://www.ferm-matic.fr/upload/file/fuxarebitobivakomofujotuf.pdf
    • http://ekvatorbl.com/userfiles/file/kugebekoboz.pdf
    • http://fittbikese.hu/files/file/26926805020.pdf
    • https://skl.deindrukdemo.nl/upload/files/xefaruxiworixufupaga.pdf
    • http://andlupa.com/userfiles/file/159435948.pdf
    • https://mygenius.ru/admin/ckfinder/userfiles/files/gorunaxevif.pdf
    • http://revucue.com/ckfinder/userfiles/files/48659450279.pdf
    • http://mrcookie.tw/upload/editor/file/221509523216.pdf
    • http://shopgraeagle.com/ckeditor/uploads/files/15897113892.pdf
    • https://primer-spb.ru/files/files/sasonevajajebekulox.pdf
    • http://hoachattn.com/image/files/19838363692.pdf
    • https://kfk-dekoration.dk/images/uploadedimages/file/labowogogibepugomeputeler.pdf
    • https://www.posluh.hr/ckfinder/userfiles/files/84072092132.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b330.bin
1c45ddb5fd7819a77e8972b8ee3b43102e863cb385108fbabf2faf89926a59f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB330 10668 bytes
font_01_sfnt_off0000cb69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 16792 bytes
font_02_sfnt_off0000e37b.bin
791b902ab4e4da461b7ecbb1e9b7a7280e871f967d020407b6c6bc807f2ac1c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 16516 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.