Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a2e51a6baf8663…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 07:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7be9e9fea0083f706c2b2df627381067 SHA-1: ce02412575e32dd45d330367ef76eedb80219cc5 SHA-256: c3a2e51a6baf86635a3b006b71e3fae59198d806a20df7f7687c1ce006521b61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier. The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and links, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://autoscuolapezzano.it/userfiles/files/64640718475.pdf In PDF document text
    • https://maydangson.com/vietkiendo/upload/file/83716763400.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/kiperunenax.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/vesujakij.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/55762148459.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/41007933419.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/74017446600.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/sodozuj.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/ragabojotijureterofif.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/37706144742.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/wukaditod.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/61184130402.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109071352206839.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161385037a0fed---20678762207.pdfIn PDF document text
    • http://mweb.cz/images/file/bebonamegibogefodit.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0f80efee322edaab9b4c7e2a0cd17ca8/wejos.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/nilawalabebodotoxux.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/70603656085.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/kufumagitev.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/pijomuwisevujuzuro.pdfIn PDF document text
    • http://scsytech.com/upload/files/sadofokurolefapofoxasu.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/57407373250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dokkan+battle+bot+apkPDF link annotation
    • 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_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 10120 bytes
SHA-256: 41fdd14540c286d27af805dbbcd05f2a5fbae14161688b1af8a3880541926ce4
font_01_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 17900 bytes
SHA-256: 00568b3bc865f293e405c4de0aa6f59b6d581e7f98746c79b7ed8b1bc81c0888
font_02_sfnt_off00011d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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