Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3798552f567de3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 13:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f9e2d9f7a1faf15ca9bf17b52248365 SHA-1: e42b72fe0747bed51ccb77ec13a61544fb59582d SHA-256: 1e3798552f567de3f4322cfe3b06fe7eda89508e6627b6cc81b284c9efa383f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, likely to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the nature of the heuristics point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/loraxaf.pdf In PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/90681866241.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/40391379973.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/matesefulajolafimebu.pdfIn PDF document text
    • https://lesura.net/userfiles/file/jijuxefufinime.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/30739298592.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/72467480108.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/86310153848.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f8be4678---45618279606.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/zibugu.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/rifokajagali.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/49037096866.pdfIn PDF document text
    • http://atek-ent.com/upload/file/wotiravetanerirexejuxut.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/sukafupanozorovexudowige.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/47369428261.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161330e6e74ae2---tujalopezukenopi.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/ferenom.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/wezidelilifibazanakazuf.pdfIn PDF document text
    • https://limsurempat.com/contents/files/tofifeper.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/jodaxuruxivagewuw.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/varuzaposavumizewigefudab.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/penusesuvutadepavilobona.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/welazijaxakakolekujid.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/87525800669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=where+can+i+watch+real+steelPDF 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_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 17916 bytes
SHA-256: 6cd12f5bc41b4e19088ccf49abe2c68a1610ebb04349808cb97893a2fe9f93c2
font_01_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 10288 bytes
SHA-256: b020d31f3d40b9383589fcb1534e581d5f9131a3c752ace71d0504ab8fa7f3bd
font_02_sfnt_off00012848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1