Malicious PDF — malware analysis report

Static analysis result for SHA-256 62838bca08f1e01b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 22:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d1feed0830e97439565634213f9c1b4 SHA-1: 3dd60fa512b28858e21dc6e80742f170554dd7a7 SHA-256: 62838bca08f1e01b28b5a72a00629d3c723af5ccbdc35ea39d76e90d2656ec89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external URLs, with many pointing to domains that appear to be part of a link farm, a common tactic for phishing or distributing further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kalashad.com/userfiles/file/goboreziwokonomome.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/40372523690.pdf
    • http://kowel.com/ckfinder/userfiles/files/1631819704.pdf
    • http://www.examnotice.in/uploads/files/lonasifopif.pdf
    • http://artediapharma.com/upload/files/99072354710.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/mogexirelixejopozovuz.pdf
    • https://kattliv.com/kattliv/admin/userfiles/file/14528891434.pdf
    • http://ejmk.com/ej/upload/files/pekefusowutusinizanesoza.pdf
    • http://thienlongadv.com/upload/files/xofanigadujado.pdf
    • http://piri-piri.pl/ckfinder/userfiles/files/fevumoluvunuzenimoworal.pdf
    • http://nwatchonline.info/userfiles/file/voreworelez.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a4610eebeaa152973e5d7821b0903194/serezasu.pdf
    • http://aygroupmuh.com/image/files/dobokeb.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469885100e3---28929934022.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/zuwutedagizuderovib.pdf
    • http://abwmechanicsville.com/uploads/files/51720477231.pdf
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/69391463637.pdf
    • https://wasael.com/userfiles/file/dobik.pdf
    • http://zehanbiopharma.com/upload/files/fulixuzedobalawabikufir.pdf
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/boderitadomojofosijaziwal.pdf
    • https://nomaquito-travel.com/editor-images/punopubelisotoz.pdf
    • http://simsvizag.com/contentimages/file/30013742778.pdf
    • http://varosom.hu/userfiles/files/57994602561.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=russell+and+norvig+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 16792 bytes
font_01_sfnt_off0000fb20.bin
8682864701f857752494dca12e70d081b1b652b15ffa9ffec19981a20bef0cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 17744 bytes
font_02_sfnt_off000128b1.bin
0e3d42721605af6a58a8087aa96a2eec8cf2e7b6ee14fbaef617e2dc90c709a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128B1 10784 bytes

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