Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6c4e9eb980f9c9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 19:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33ee80640421870c908cbc06b26f404e SHA-1: 7211a54c709af034655cd5d263c920d2899eae6a SHA-256: ff6c4e9eb980f9c9f4f2be47f51481e2606720f72bbfdea846548a94962037b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host many links, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=stickman+warriors+super+dragon+shadow+fight+apk PDF link annotation
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161425d9120efa---73672050996.pdfIn PDF document text
    • http://koutingchina.com/upload/files/51112397765.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/ferefos.pdfIn PDF document text
    • https://trystsalonri.com/images/file/53044862551.pdfIn PDF document text
    • http://keacg.com/upload/files/risexafozozogipif.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/15054591373.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/87289526600.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/84085527709.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210916180057.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/fusarivoderasupekes.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/mavudo.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/30808722327.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/17105044015.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/xinagozaro.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/tojexibasuwakaxegajesi.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090803595552.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/suvirumamikimopijafurew.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/nemoresarurijajoroxada.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/77821333653.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/vobelopa.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/98129257830.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xavonoloj.pdfIn PDF document text
    • http://ty-int.com/files/files/48013745529.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_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 11372 bytes
SHA-256: 0cbd4f91d8dbb683d901e8bbaf390918ce7b6220bcbac40cae1793ef298cd5fd
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 18156 bytes
SHA-256: 04234ba43e36da0504c41184242e52194b9bb91e3ffc5e739cbb571c7d12f22e
font_02_sfnt_off00012199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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