Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c2ec959db59916…

MALICIOUS

PDF

71.8 KB Created: 2021-09-20 19:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 723a20fbaaed96009fcec84489adfc0e SHA-1: 5e020b4cba0aa6d82bf4c17392ab9db12e16d484 SHA-256: 11c2ec959db599161f36aea3a1a47e28e847d3a7e49536cc8aa2eaabc2dae113
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of low-quality links, a common tactic in such campaigns.

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://infrive.ru/uplcv?utm_term=mi+10i+5g+call+recording PDF link annotation
    • http://bobmeetin.com/media/galleries/files/12522688875.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/940065218.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/peluwewemadoze.pdfIn PDF document text
    • http://iwort.de/userfiles/file/nawumabugezapigubas.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/78575323259.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/tixobavojopit.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/xalojoruto.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/tijefumaxejid.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/62056903150.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/97577737930.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/24992755783.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/sulonavanorenapilojigup.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5fabeb2a---jotogebitemopeme.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/91301935335.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/fazuvaweretupo.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/94956852226.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4bc814313---tipafizokef.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/33298022376.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/kusugorodilaxamipipeg.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/37089176372.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/susezevegakexifixiv.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/lixamatigaset.pdfIn PDF document text
    • https://themalc.org/files/file/rakikagabuwajonam.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_off0000b6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E0 16616 bytes
SHA-256: 69bc1633f7e6801a17cf6c7a634fbb40e51d5b6de019280161fdc762a143809c
font_01_sfnt_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 10580 bytes
SHA-256: 12e59b82abfbeb115616b35e4b41b29569d727982756fed06c41f0825e070768
font_02_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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