Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c078e5befe3681b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 04:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a40faf0995b82f5ddd8da65daab6ff60 SHA-1: e9c8c1045e7f326f585357a969b83fd70894ee5a SHA-256: 7c078e5befe3681ba8f21b25eb4d38d2176a4a6e60debed889ec873a1574cb89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. ClamAV detection and ML classification strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the assessment of a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://solelane.com/ckfinder/userfiles/files/lakunakufefirovo.pdf In PDF document text
    • http://alwaditrading.com/userfiles/files/46420266840.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/sukapitegilubegi.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/75979517642.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/vepisosajazuzomugelolim.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/59843660116.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630999084.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161413a5996920---9590858794.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/80729161190.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/17228905673.pdfIn PDF document text
    • http://fluorescent-training.com/file/vewowikovuleva.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/93667017974.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/nazarovafiwuremanizopakik.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/22726960806.pdfIn PDF document text
    • http://dasbluemchen.com/jesavovepuzukuriz.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/nupezinip.pdfIn PDF document text
    • http://grandfiltr.com/files/file/80996187622.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/mijavajerizufobasuzu.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/51074904644.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/vebifexerojawubikovuvad.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/zugurupisuxonetipi.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/85524044597.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/xexotekexovaduxerorilepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=india+best+game+onlinePDF 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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 15380 bytes
SHA-256: 5c51057c8f734c37f5293c8bf13da164cf433bef3fbadb7e0c116c3bedcc657a
font_02_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 10580 bytes
SHA-256: 809ff6484a2d55b9caac99972df4ba5e4280c663100ded4a21ab0255e4363151