Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7ae67152d48493…

MALICIOUS

PDF

68.1 KB Created: 2021-10-03 09:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 76874e60e3301f324b3e56333e03272c SHA-1: e5249b7b459f22dbb3ed288e32b9c2f8bbf16098 SHA-256: fc7ae67152d48493274ace1597dd3bd68bfda5766e454fff38e5f23d481a3eaa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=bill+paxton+and+matthew+mcconaughey PDF link annotation
    • http://www.valaisconsulting.ch/file/puxilotanirosojiwejapefa.pdfIn PDF document text
    • http://tatvan.in/userfiles/file/logunula.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/vasefazalidosunutuf.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/tugesikona.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/61502533214.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/xamawologomudaroniped.pdfIn PDF document text
    • https://duel.pl/userfiles/file/18457333001.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/xugipeziludetalulenelo.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/sevufi.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/dukibonabanigodugapeb.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/xojifujuredumi.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/tovuxikodutijazunomepu.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/4015936492.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/70342857342.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/72499117553.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/220627439.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/zepefuzutafu.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/51583353116.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/34688292636.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631121597.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/50298f53a9ca4d86ce39fe3586164927/31223515509.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/n00trsrck8nm2h3ged2nsjlalt/34997893105.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_off0000abbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABBB 14876 bytes
SHA-256: 13e0ec2fd2db91be95b69a5f1ed568821e4fe2445b25a047136a535ff02b42a0
font_01_sfnt_off0000d117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 11148 bytes
SHA-256: 65a592f09fed658639ef4485caf8c4a3b5a3127b68145544a49f85509d615f4f

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