Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7602aa01ab01d8b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 13:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd019060f27eebaf937c3aedaf3aeaa3 SHA-1: 532f003f6364f5456f619d55e5d4dd98f11036d4 SHA-256: b7602aa01ab01d8bc87eb9073c3e32a9a29d9a7f59c4be059c3bb7a86a491f74
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a lure for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://bostaninsaat.com/image/files/64833839997.pdf In PDF document text
    • https://bakotech.at/uploads/ckeditor/files/38488503108.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/dutopuxumukid.pdfIn PDF document text
    • http://klinok-saintp.ru/files/15005361782.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/mozedixonugufanases.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/gagobimulufufotonigudupi.pdfIn PDF document text
    • https://jjpremiers.com/files/rifovujidezizujulizawa.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/13271072843.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/78135905763.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613927c51fe26---tapenibutonadawiwa.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/weriselug.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/tazavulabebilate.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/godakimidamalozesuzetev.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/45125449971.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/pimawigogowu.pdfIn PDF document text
    • https://nistd.in/userfiles/file/zigexi.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/92816491440.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/62134171543.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/nudol.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/kezesenapakaropuza.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/49548998748.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/wubajetejifabuto.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/moliwilogip.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109031358126990.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/74065408973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+unlock+t+mobile+android+phonePDF 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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 19252 bytes
SHA-256: cc9a0f76a9ed8f99c3728d47f120bac95c3f8521e320fa6479fcc369354ab95f
font_01_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 11020 bytes
SHA-256: e5a02db3c5f98ea7692ade6e9ab040c8dd2f540325f4a9c0e4aa0c08777331c5
font_02_sfnt_off000126f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1