Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a034447d4d9e20…

MALICIOUS

PDF

88.3 KB Created: 2021-09-16 15:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 502b6b3ac13ef00d89c9978df21cca20 SHA-1: 2e900616067b87425a8cf2bf10c4c27af438e294 SHA-256: 70a034447d4d9e2002772d615f0c470f7a2cf0e989c9e8a84c45ce03b94025ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, suggesting a link farm or phishing campaign. The presence of external URIs and the overall structure strongly indicate an attempt to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=can+t+make+in+app+purchase+android PDF link annotation
    • http://demirlermetal.com/resimler/files/5574486634.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613489cce12c0---fejoseritasifolegiruk.pdfIn PDF document text
    • http://findusafranchise.com/files/files/nokopegidotofurepoto.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210908_630E4FBB674EB405.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/naniremokonivogari.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/92717498644.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/lulemoziguxod.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/kokisuxipajugufitotanumu.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/puzakumetibuwi.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/46095899773.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/32141263987.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/6260998497.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210902225120.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/sijinig.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/vedunomawixularugurebu.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/pexuri.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/68547497679.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161342136ecd58---sogogebojevolipezidaji.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/45862431962.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/tanipizezedu.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/25425935136.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/54535703732.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/42069535675.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/94272152646.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/lulijuvib.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_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 10956 bytes
SHA-256: 0be1541cdeab8cc932fbc333591f508ee079148ce858348601206578e1d897fd
font_01_sfnt_off00010f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12717 17284 bytes
SHA-256: a4e96888498234a3386961a379776c6d7585684e6e3e0cfd904fd81345f885c1

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