Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fed5137ac28aac…

MALICIOUS

PDF

84.4 KB Created: 2021-10-06 21:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e5930c4bdbf75b15054da558c95c7ff2 SHA-1: 091ecded2369af64f3471df2f27214353fe084b8 SHA-256: 42fed5137ac28aac2813a113e3aa571a2affdd51a4131a3a560bab838cf89c9a
146 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest an attempt to trick the user into contacting a malicious entity, likely for financial fraud or credential harvesting. No scripts were extracted, but the PDF structure itself likely facilitates the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.tempshift.com/app/webroot/files/uploadimagesfile/gekowetafafejibo.pdf In PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/xesirigugi.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/dagegovetotamuwomo.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/28032334891.pdfIn PDF document text
    • https://brakos.it/file/29339695541.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c4fc69b08f---77982582494.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/93665560753.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/19770457045.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/3139628515.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/generifudani.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/nolotexodigubemotafan.pdfIn PDF document text
    • http://kdekdyjak.cz/data/3411970094.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/xiwumoxaxetejuvoxoto.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/sebosijo.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/90967842958.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/fonojixup.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/gudomuv.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/nabitasawaki.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/pabisokebomadazege.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/xavipatujawemavidiviwew.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/08f9820d8130dcf9670ded623f677614/12027095461.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/37380332132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+use+phone+in+gta+5+pcPDF 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_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 10816 bytes
SHA-256: 67e1c6e70817182e76c34f40a2b6a638f1d1f2432c996b5974413508298e0e27
font_01_sfnt_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 19220 bytes
SHA-256: 52b425b21156ba4891b3686b8d5ecab592083e17e15d57324bf134bec9a0c259
font_02_sfnt_off00012bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1