Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7f9cc4b7dc244f…

MALICIOUS

PDF

75.2 KB Created: 2021-09-15 22:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea3719700aafd7d71fba1871b3a254cc SHA-1: 13f0d9f04c93a7ebc955d1c3e86216ee40970c96 SHA-256: 9a7f9cc4b7dc244f75b34f0e429955baee45deeabde1eb499e06de5a02d837f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. The embedded URLs point to suspicious domains, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=bus+simulator+2015+mod+apk+android+1 PDF link annotation
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowisotifegotuzolep.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/rovetonaxubaruduxug.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/zuxeterujumo.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/67229592821.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/dujoviporopatajomanivipok.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/38862339060.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/35317291050.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/84781567688.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/87845590893.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/zadeburafujapevuso.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/jevam.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/86271689237.pdfIn PDF document text
    • http://didula.ru/img/file/ganewa.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/pojesuxiteruf.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/24925474241.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/90189382477.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/9541033844.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/81005113068.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/tipima.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/63186858906.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/34147571982.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/tiwowidexizuwuposis.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mofiletelejalume.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/jorikiterunigufezojexu.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/13954728810.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_off0000c0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D0 11096 bytes
SHA-256: 58cb2b4a7eae58211b7809b7ff13fe2b410d473b5c17c5807c69abe9485c2234
font_01_sfnt_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 17228 bytes
SHA-256: a95931e514e2bb80efbc382978438a8f5016dc1b3781f72605afe24c41f54b1f