Malicious PDF — malware analysis report

Static analysis result for SHA-256 68337ff028a1c580…

MALICIOUS

PDF

71.0 KB Created: 2021-09-19 13:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f140ce9077ca4250f44abd6674e613f SHA-1: 77b268c7291725176fdae2bf4639634aefe5dc6d SHA-256: 68337ff028a1c5805335bf699b248213e5934635265b52afdaa607af1d668cf9
146 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or redirect to malicious content, aligning with exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://hanyangsteel.com/files/fckeditor/file/167355810561343bb45e735.pdf In PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f7aa3644e7f87b2cecf75cc7fff300fa/91388204554.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/9615617265.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/musepadafibufegumijes.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210910203148.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/38708609680.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/mibite.pdfIn PDF document text
    • https://morabia.fi/images/file/nefasapakixowujiriz.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/gizaxawedowava.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/kaxidakuxezuk.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/98580856499.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/fajirapurex.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614256e45f758---55029495295.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/nufovus.pdfIn PDF document text
    • https://zzhqhi.com/d/files/pipabelemuziw.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/94947107236.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/13958074848.pdfIn PDF document text
    • http://posuni.com/userfiles/file/xabil.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/40401146152.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/nirigawawulofet.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/83688015768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=business+research+methodology+book+pdfPDF 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_off0000b54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD63 11564 bytes
SHA-256: ac44d74dfa6eabb9d38af25fd2c665c1814aad13a72aa20b03a408ec3d2d986e
font_02_sfnt_off0000e849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 15444 bytes
SHA-256: 8e42c7452d2a6ba558f2d8a03352c2d26bcd24dda3d8999b2d1f3bbd4b257c58