Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aae1394b4b30ed4…

MALICIOUS

PDF

78.3 KB Created: 2021-09-23 05:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8396ad6ce0c40de9d71ac9b23dc38be SHA-1: 387617f9f346efc4222d166a412d347628bbd6c4 SHA-256: 8aae1394b4b30ed4125e82d526db5fb033007511e0393cfb2e419e3e40db93cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicating a high likelihood of malicious intent. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure to phishing or malware download sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://gangnampools.com/contents/files/kanifepaledarasagulevedam.pdf In PDF document text
    • https://peiitw.com/Upload/ckeditor/files/17798696963.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/38237936000.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/9681027046.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/dewonurirelonek.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/15416143233.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4ep0vv7icd29flh141h2o73bhu/44992500041.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/92315955494.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/41413913854.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc1bba66f2---14734666705.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/3281930649.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/37777807271.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/47490089536.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/lurupis.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/68284581111.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/11924218276.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/89335836011.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/pobifasagebufufajanino.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/40460636476.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/gibikunusifokolibi.pdfIn PDF document text
    • https://duel.pl/userfiles/file/42514478519.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/fikon.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/gosebevavip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=clean+disk+using+diskpartPDF 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_off0000cd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD96 17888 bytes
SHA-256: c3519e70479eb340933f1edff639b80f42b5b4431b62a3411c3f4ae3243fcbd3
font_01_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 10672 bytes
SHA-256: 3a372a9a5a691c34c712e18beef1884579972f4533ac27832226566b8a437835
font_02_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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