Malicious PDF — malware analysis report

Static analysis result for SHA-256 845952c288ec08ef…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 19:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd3f5503bcfd370b9aefa1bdfc4a76c1 SHA-1: 5b5120fe2396f3d4fe0baa26c5dd25deda44239f SHA-256: 845952c288ec08ef3aecab31364266c6f4c9405da62127df406dda44e5b96def
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier assigned a high probability of maliciousness. Heuristics indicate it functions as a link farm on disposable hosting, directing users to multiple external URLs. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

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://catamma.ru/uplcv?utm_term=what+is+the+purpose+of+an+eportfolio PDF link annotation
    • https://ecohort.com/userfiles/files/desiled.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/76595391385.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2585d5120c9b4939aa50a46de3226748/80065832589.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/99809403590.pdfIn PDF document text
    • https://renewone.de/files/gitulenevimiratuwojip.pdfIn PDF document text
    • http://lgassociates.in/uploads/61863155110.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/loduwiko.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/jizikejoduzo.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/kodowujakamudegiramaxan.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/taveviriri.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-21/20210921195618125497.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/jabagigaxafowu.pdfIn PDF document text
    • http://davobio.com/upload/files/66225657951.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/14302922998.pdfIn PDF document text
    • http://devveb.net/userfiles/file/denivibubaxuped.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/giluzojuforukazodujezenev.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/zinikewodewivud.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/dibasozilo.pdfIn PDF document text
    • http://strahyi.ru/images/file/96968331210.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/25988509567.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/45172918640.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/juvetuguludumokewito.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/pagako.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/15252980769.pdfIn PDF document text
    • http://wsm.hk/images/files/91945027107.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_off0000b29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAD 15764 bytes
SHA-256: 3922291e9c40b3da526fe625ab49120c41f2ae4a7b3284a4c6ccd7c9da0707f8
font_02_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 10548 bytes
SHA-256: c96e5b1ca17974262e2e05551a59784bb0110b55774f30575d51848aa6d9b314

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