Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c538881c843e747…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 10:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 712e1b34ac7854019bcef805bdc7e309 SHA-1: d7dad57ba10b0133b5c7f3c4f718ab6ff07f116e SHA-256: 1c538881c843e74723f514965d29cc5fcc6179ed3204a943e2d3d093558061e0
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to exploit vulnerabilities or trick the user into downloading further malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is likely a phishing or tech-support scam, aiming to deceive the user into initiating contact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://primaria-ciocirlia.ro/media/file/43946622409.pdf In PDF document text
    • https://saatyapi.com/upload/ckfinder/files/53531846600.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/75866908976.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/96650967122.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210911145304_wz1x0s.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/xiliroxafobolir.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/50204143800.pdfIn PDF document text
    • http://iccarrentals.com/files/file/89534656105.pdfIn PDF document text
    • http://chinahongji.com/d/files/48120364160.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/8596200441.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/bawijo.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/87594213219.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/93288016761.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/1521438243.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/24095120022.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/tabijefitoferilim.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/jupadagixakazekajam.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/24788150208.pdfIn PDF document text
    • http://vo23.ru/upload/file/46181678997.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/tepevi.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/99091987721.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/8302957735.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/suwawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=my+name+ringtone+maker+with+musicPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/72766119740.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_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 18340 bytes
SHA-256: a33a5f6012946a6183ed9597decf90cb805dfabd250052a0b18e74b6c1f88e74
font_01_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 11016 bytes
SHA-256: 6189a8c7dbf3fd291812689ad90f9958032a2eef70044d7f6ad5b1ea9342ed4b
font_02_sfnt_off00012b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1