Malicious PDF — malware analysis report

Static analysis result for SHA-256 8affc66ea3ea92c1…

MALICIOUS

PDF

75.4 KB Created: 2021-09-21 07:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b246ed8cc47ab828edc773b2f5060562 SHA-1: 7c80854999b11d897117d08aca0c6b8aa241a96e SHA-256: 8affc66ea3ea92c1bd7c0ac42493c3e5ccbe694102bfdc6caf02812a92a8939b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it acts as a dropper or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=bullet+echo+android+1 PDF link annotation
    • http://mwcapital.net/ckfinder/userfiles/files/64141082076.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/fidudetub.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/buraxoziruna.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/3675282400.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/gujuvuripovejosevaf.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/86503089842.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/61298596654.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/botulorofulenenijepupemi.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/70369493181.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/puwobuzopuw.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/nilako.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/pisavaririvixadu.pdfIn PDF document text
    • https://ksboutlet.com/file/files/91853260465.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/sepanidosokusafekiwa.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/73230391185.pdfIn PDF document text
    • http://www.moyekolodin.com/files/47307637955.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/59485732272.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/nafapadideni.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa9384a76---mazumewo.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/pesukifolo.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/velemelokexaguda.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/45445127245.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/luwifafusobojapigigodorix.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_off0000c11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11E 10504 bytes
SHA-256: 6b014b892e8875e8df89c8aace92e79ca92eec790208432845e702dda67388ce
font_01_sfnt_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 18028 bytes
SHA-256: b8ff6fcb50899b3965617e66e0e8e9abc1a1d65a6ca8b7e857229de003c84b4a
font_02_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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