Malicious PDF — malware analysis report

Static analysis result for SHA-256 af51aaa0ef2eaa2a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 00:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e56d1e9713ec6d57eabe3fb76ee4a91f SHA-1: 136f69a472802112318dfdbe9427a712295592d7 SHA-256: af51aaa0ef2eaa2aba65e91e6a9619aeae52ed7a2f8a6994851ab942f6ac477f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the link farm point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://garglob.ru/uplcv?utm_term=how+to+unlock+your+phone+when+you+forgot+your+pin PDF link annotation
    • http://cocoabuterol.com/upload/files/29746524847.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/15746482334.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/mokeluneguf.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81187855806.pdfIn PDF document text
    • http://freewest.at/kewuxivuze.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/dalusalosepi.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/36473788622.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/j9q228d64l6ds3ofi6em398m21/64265659096.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/84444519636.pdfIn PDF document text
    • http://entrackintl.com/uploads/88889820266.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/kazaxi.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/buturirimoke.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/38707427512.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/nimobede.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/6357166444.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16140b82a99cd3---mokosiwadinagenaf.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dijamuditobome.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/24920370793.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/62758016534.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/kapiwivej.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/rupopivejo.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/49579690122.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631327108.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/1674966085.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/vagusovasaminodiz.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb09767074---51770499361.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_off0000b3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EA 10812 bytes
SHA-256: acf2d84c9402ac7c88f263a0015567594a3fb739b03628479e9fefd546b8715e
font_01_sfnt_off0000ccd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 17460 bytes
SHA-256: 992c97d4cae8ab00b85f3094559dcae1b7b25bc3808f09d7c00bf45a470a0ead