Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4f8ff65d290622…

MALICIOUS

PDF

85.8 KB Created: 2021-10-01 00:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f6700a91cc9bb928f0f4b409851e8d38 SHA-1: a22b6405f7d496e73bf0d2b909574deabb4540f6 SHA-256: da4f8ff65d2906221f51308f14e183bc4ca89bc137d4640e4a9efa8dccfa04be
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=bangla+boudi+chudar+golpo PDF link annotation
    • https://watertorens.nl/userfiles/file/wokozomipasodifu.pdfIn PDF document text
    • https://begili.com/uploads/image/files/97679690283.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/tolalofimiv.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210906213752.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubovobifajoseke.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/dofubazotubogirelewe.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///nemamir.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/84298209844.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/99482079499.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/lewemagepa.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/944930901.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/watezarafemirikak.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/kegasilifuximerobulaneli.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/20853616125.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d8e9898c---83120807671.pdfIn PDF document text
    • http://skupka23.ru/upload/m/90026450620.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/rafozetoto.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/wawuvujil.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/navoduwufi.pdfIn PDF document text
    • https://southafricapools.com/contents/files/99088826873.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/bawukoselelamunizanafem.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/90558450198.pdfIn PDF document text
    • http://www.agot.pl/upload/file/24047489849.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6F 10688 bytes
SHA-256: d7b188d45bf6b18fc3a9d029f029a6beb0e3eddfd1c2aa65342f99b23cf4a980
font_01_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 20372 bytes
SHA-256: 17beb4f1b14223edb5e218023fb23e2acd2d36439d8b6bc54c37f67fa2278899
font_02_sfnt_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 16444 bytes
SHA-256: 6637e82f98fadd8b589f5d32f1eed7d2ac4961fbce3eaf8d92dedaaecd73f2f4

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