Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f5329cba88c3cc…

MALICIOUS

PDF

106.2 KB Created: 2021-10-24 11:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 36f93228a53b0219d5c6201f0eea3ea7 SHA-1: 63da9ec0b24bc350354d4bd66bbe5b17195e38e5 SHA-256: 91f5329cba88c3cc098141e43182b0a6fe448011459bdef7f2761f20cd75b540
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://edenestates.com/ckfinder/userfiles/files/59479624736.pdf In PDF document text
    • http://cdmvt.cz/sites/default/files/40101578409.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/kitabasawumidukosawelamo.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210912075505.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161615f55e139c---jolapepigisavesirivo.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/vuvebowogeforurejubimujij.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/71377349706.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/zotevaterosijanixo.pdfIn PDF document text
    • https://777mto.com/contents/files/98537042804.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/vimipevorumizopo.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/diririlifow.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/josufatire.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/mafezisuwopifime.pdfIn PDF document text
    • https://kaparatt.com/images/File/70551571608.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/bizujiguluga.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/zofisuvadiravukifukesopoz.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/98400699494.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/xebubevolipababinirebiron.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/pesusudug.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16168bc35b8fca---85599719309.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/90493892986.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/zogivujuzosodup.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/59683576066.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/tarokarudewafes.pdfIn PDF document text
    • http://maidichike.com/upload/files/72617782141.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/59289200134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/6Zflnl449io/uplcv?utm_term=bursa+in+synovial+jointPDF 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_off000138d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000150e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E9 19272 bytes
SHA-256: d29067c1fde1bde92e4057468a33734b83c17cfb97239729be050fe1bbd587c7
font_02_sfnt_off0001834f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1834F 10432 bytes
SHA-256: 132cd86e8644f016ce4957a2c1781e662d8c49f873c3c01550e8f6ae978c6a6b