Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40b0ea380c9a80f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 03:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70c18d1f35778458cf9d357b90f23b94 SHA-1: 69cb16967e2a816a8b9cf76ba40a003f95ff1c16 SHA-256: d40b0ea380c9a80fdfd5b1a33a32240fa4098e1e64f04020d06af74d4be0b263
146 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a callback phishing lure, prompting users to call a number for billing or refund issues. While no scripts were directly extracted, the PDF structure and external links suggest it is designed to exploit vulnerabilities or trick users into executing malicious content, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://peoplefoster.com/pliki/82006982814.pdf In PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/51106609774.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/80216197065.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/zawuzebufan.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/mutabetixeduxasojakidexim.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/lamokesavonofiboxidisowif.pdfIn PDF document text
    • http://exima.kr/userData/board/file/zudodamurixezed.pdfIn PDF document text
    • http://agmapure.com/upload/files/94423695405.pdfIn PDF document text
    • https://domilot.com/uploader/files/97426054610.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/gadog.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/rotanukiluwa.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/24751893171.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/vajatijinuwet.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109040359280033.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/87877443378.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/3161458253.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/vifaxeg.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/lidulopaparewaxifidi.pdfIn PDF document text
    • http://stefani.cz/fck/file/vagaruxatolarix.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109150151483724.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b2c8d9a4f---38769251872.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/poratomokomoxe.pdfIn PDF document text
    • http://esen.life/userfiles/file/fepovupame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hand+signs+of+do+re+miPDF 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_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 10544 bytes
SHA-256: 83a3ea4f15c51294c16a5cba88f8f455037693e5d13b9b084ef05fbf77baccb0
font_01_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 18388 bytes
SHA-256: 43816001b2e967ff2d0a9766a8fe01c0b6791f7e209822b232011802fb3542cd