Malicious PDF — malware analysis report

Static analysis result for SHA-256 671eb8cc31491577…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 23:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6324f883953539afac7f5b264cd418ad SHA-1: 4781625232332eadc6263b8d5d1e264b5a8c4b2f SHA-256: 671eb8cc31491577d172c87747e00251cbff2c239ffde8c33efe399512aa32f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs points towards an attempt to redirect the user to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pixomot.ru/uplcv?utm_term=mobogenie+apk+download PDF link annotation
    • http://artio.pl/files/files/16383011969.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/15361021877.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/44822315327.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/pepixukunudikawowejuxazu.pdfIn PDF document text
    • http://dakov.hu/_user/file/lobabukusapipen.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109090301149703.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/rinuzukexi.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/83004141575.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b779e460ed---94155636472.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/pabobotavabapolatozet.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/12789669115.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/94400691962.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/mojejipopiludob.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/87755087622.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/musuzunedojozumobuwiro.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/96976060430.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/59257662107.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/48240129348.pdfIn PDF document text
    • http://z500.si/files/11059637553.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/refidofibojexunonamo.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/68298677676.pdfIn PDF document text
    • http://www.agot.pl/upload/file/34318396750.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/48530639889.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/toxomaruzaxelide.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/77016907282.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/72253417659.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/velewanunakamekadipowopez.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_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 17764 bytes
SHA-256: 7085553f42066844dcd41174105b070a9f569a2890c0d21a79fc66a9017fd801
font_01_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 10512 bytes
SHA-256: 3e91860e7a2f029ca11e7002d661d15e01ef2c08e2dc0133d7a961b7916defd9
font_02_sfnt_off00011a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1