Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45612a3f9454f42…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 00:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31717b83db84e5e6fb0cda52f0f9ec5a SHA-1: 0d94e8fb8389aa87a8b59bb8d33ee7d2bda1ab64 SHA-256: a45612a3f9454f42f44784952af0eb232e29a30aefb4fd638d796220e66bf008
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'SE_DOWNLOAD_BUTTON' indicates a deceptive call-to-action, reinforcing the malicious intent. The ML classifier and ClamAV detection strongly support a malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=windows+7+ultimate+sp1+64+bit+iso PDF link annotation
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/43220815263.pdfIn PDF document text
    • http://e-sportis.com/images/upload/pokebaxu.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/43889174263.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/88644811629.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/60058082844.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/fobuvabi.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/74465926489.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/botagozav.pdfIn PDF document text
    • http://xaydunganphubacninh.com/webroot/img/files/76936173460.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/patuzinibitupit.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132d54db34cc---84004655810.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/971171152.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/relowoxol.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/foneligosu.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/gulugiwiwuregevotajesewem.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/73577420774.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210903235937.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/90511623345.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/fewezix.pdfIn PDF document text
    • http://synphabase.ch/upload/file/tufirawijajupatitogi.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/sixegorexexi.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/27867997988.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/42894979766.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/zixamazobufulafulavubebo.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/poxajutoxudazuluvusinim.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/mawipuvipelanavol.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_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 11120 bytes
SHA-256: 46df071f79b1c924a2c715c74be2c0879d2fa7d694702b266a236159b84a5681
font_02_sfnt_off00011072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 17396 bytes
SHA-256: e8561a066977c9bb86128376cb67e2e8a01fcb026bb83bd66269d4d1e2e16d41