Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b3901808a1671e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 11:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 28302f9057a0d4cfe4e1559304124744 SHA-1: 30f5563b581d411f82e0b46045f524b545f17d7d SHA-256: 16b3901808a1671ea55df0b7b848a7a5b483a01714fbd28702ed532555ceebb1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable domains. This strongly suggests a phishing or malware distribution attempt, where the embedded JavaScript may be used to obfuscate the links or perform malicious actions. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=jak+usun%C4%85%C4%87+aktualizacje+systemu+android PDF link annotation
    • http://yangpupark.com/uploadfile/files/80890666785.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/mojojuxu.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/pizija.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/xawodogemigunopipoxukolar.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/sidazenidupepebirevofego.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137aee15105b---28133029451.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/13600914237.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/nowazilezuw.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/dudotawogesepifuxusemila.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/goverodudesemewij.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/disukasamusuwen.pdfIn PDF document text
    • http://onlinevay.com/upload/files/retipupekojunamobedelu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161385c61054b1---23209818694.pdfIn PDF document text
    • http://minerva-collection.net/files/files/nifasoruxigamoweveru.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/71210170597.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/48372884576.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/57581893189.pdfIn PDF document text
    • http://kite-surf.sk/files/51318189143.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/7208008081.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/wiwasutapewis.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_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 11392 bytes
SHA-256: 8dc514a2ea4745bdb0b7af07566fba0460d4fe5737b8b09eff51f11e1f897f76
font_01_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 17860 bytes
SHA-256: 51725e543faa263f54657cafc21047e511d7c3681d27e75cf5f5dbc7ce53ab0d

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