Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc0ff4d15e8c896…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 11:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6802f0c802e612b78c580faea73523c3 SHA-1: 52e6befc1d519abe5f1853cca36339a1ea9657e0 SHA-256: bcc0ff4d15e8c89651c87bb0bf8d438801405739c1d0e4e7f6db6a971ada8dde
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF structure and the presence of external URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=wireframe+component+library PDF link annotation
    • http://royalrep.com/userfiles/files/menidini.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/viwogereju.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4m4psfl7vr9r2dnmm31an5jgdv/37223570359.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/69752996246.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/13159206041.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161344648aec46---penepuwuv.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/wexexelumozikitemamigax.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/fiduxevoboxuja.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/88707385008.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/logibinuni.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/4596055.pdfIn PDF document text
    • http://chinalabware.es/d/files/wepasarivama.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pabobebijuvilogupe.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/gufokufufafagekajana.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/bisebajovefune.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/31261166716.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/jabujor.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/budefi.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/metumuvupowebabitusazasav.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/filolebuzuja.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/90641421503.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/44558967940.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/79167736521.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/15882115260.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_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 16696 bytes
SHA-256: b028178fbad22627608b156ce54566af9e6d403c00c535648ec80e5016992d92
font_01_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C6 10720 bytes
SHA-256: 00214eebc3d1fdb6fa6f0146bf22a2a821015461240b6de9ca0841f9b27b3ca8

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