Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb388b2f09c93cb…

MALICIOUS

PDF

84.6 KB Created: 2021-10-11 06:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f5fd7545ba2a4304255fc664d43b5c73 SHA-1: c8f310904973ab4338bbdb840dac3557309cbb0a SHA-256: cfb388b2f09c93cbcce73bba276f2d3f748ce741b068dd1d4cae977de8f329fb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to trick users into contacting malicious actors under the guise of resolving a fabricated issue. The numerous embedded URLs point to a link farm designed to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://adikmanis.com/contents/files/dufaresekifijezususixu.pdf In PDF document text
    • http://emaaravm.net/upload/files/xuxesusovuvukogenapinelo.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/gixazuwak.pdfIn PDF document text
    • https://binhvi.com/upload/files/72527647140.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/xomuxenesugosizodizorujo.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210923144423.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/40191543401.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/75612331707.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/powipiwow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c82e65b84---tuvezewubix.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/76591563983.pdfIn PDF document text
    • https://beleznayauto.hu/galeria/pictures/80274508521.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/99905139872.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/jajokipidotixo.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/masonuzejabulubowuleru.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/zuxigi.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/10341566717.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/10403927339.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/90632604954.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/64177715941.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/zojeribojifitegizus.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bda903c9deac1c258ac76ee479f703c3/rawuzeweralipagifu.pdfIn PDF document text
    • http://chemicalengineers.ie/images/9924426896.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/dojaxuju.pdfIn PDF document text
    • http://abworder.com/uploads/files/misiwedibawudejonunas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=world+tallest+building+in+futurePDF 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_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 10760 bytes
SHA-256: c7624f51ad585a9eb2322e07dbcec8e83a101fe3e8695e5f1de0d617f54e9ead
font_01_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 19504 bytes
SHA-256: d33b1558b11049b9e1293b545b508201bc3b27e17a86b2824d010fdcb7637fa7
font_02_sfnt_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1