Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cb2ca7b58d5455…

MALICIOUS

PDF

75.1 KB Created: 2021-09-14 00:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f8049eff7ff19bea3bcbb41d7d515e8 SHA-1: 8930869a014d8279c3a4c0e3030c21be5112de81 SHA-256: f8cb2ca7b58d5455123e522eedf22b7abf9461ace00e2151c04795b481f777a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links pointing to potentially disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the nature of PDF exploitation often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ore-processing.ru/d/files/95601846952.pdf In PDF document text
    • https://kalashad.com/userfiles/file/soxozupubufagesuvawibileb.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/65069133934.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/80888698785.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/31714764810.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/95353448336.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/gazidadilosi.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/sifakitaxagasetebuzapeg.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/5059869240.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/69495649498.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339be8d087c---24854812662.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/tanomixinubekexidu.pdfIn PDF document text
    • https://eetravel.net/file/58274883771.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16136ec2aa8ea4---jowajexelo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5f9a403e4dfafb67444c49892de9686b/sumaso.pdfIn PDF document text
    • https://bliznacite.com/files/53369478532.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/51167092638.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/raderorufizejimitivo.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/10785287046.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/62183511724.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/tewivekiwopuvuvewu.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/popixosebimesivoga.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/54404876365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=design+home+cheat+codes+2021PDF 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_off0000bf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF82 10968 bytes
SHA-256: 28bde1d11748b6ea84229f27f1b87cc842acd2f708adac727049ba40e4d7d595
font_01_sfnt_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 17668 bytes
SHA-256: 33ca47e3f3224705189c0fc23bd06bb6ed53f15984a8d04440f82af64aaea507