Malicious PDF — malware analysis report

Static analysis result for SHA-256 f670aa4acef16cf3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 17:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20ae98e044647112bf6084253f78e128 SHA-1: f83ff3355c70ab866bd3243c9c20c56490e3e720 SHA-256: f670aa4acef16cf381fa55c326696defcaee0f9c9d4f845138aa8bbd698981e8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier's high confidence indicate a malicious document, likely intended to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=light+chaser+mod+apk PDF link annotation
    • https://imagebuzz.net/ckfinder/userfiles/files/pakemefevilosijaf.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/59276698010.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///2441763739.pdfIn PDF document text
    • https://makenie.com/upload/files/vopimomupeto.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/32914727843.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/9580915063.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/69058285790.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109140146113483.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/18258629693.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/83066360646.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/37324688581.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/62720603809.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/lugozalasaxo.pdfIn PDF document text
    • http://maxbrio.kr/files/files/fofopetirime.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426012845bd---gidak.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109150900315281.pdfIn PDF document text
    • http://samtekelektrik.com/files/63396337434.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/xixafufa.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/14fd0f8377c61410c3046b6b095bb692/33781436154.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/vuvaxojozo.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/33398411495.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/23557358158.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/32274187279.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/xusotigitilapu.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/51849351995.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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 17772 bytes
SHA-256: 98f07cd82775b169b2d997e6c84f8b08ae82c56765d146d062f333f772a80d56
font_02_sfnt_off0001226d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 10860 bytes
SHA-256: 8797e0043b9eff66c1722671747a15f1bda44dfbb42f1eea452f12d3bd90c6c7

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