Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abf47168236f77e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 19:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e86d6b324506abbdf502da4841255892 SHA-1: 7a2a02d2c72f5fc08ae4a1b97c5282a226144417 SHA-256: 1abf47168236f77e9812012f0f6ddfde81be16127846ab76cc776f8b90e63203
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to call a number in a deceptive context. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing attempt designed to trick users into engaging with malicious actors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://fobas.cz/userfiles/file/33758275941.pdf In PDF document text
    • http://somkuthyoptika.hu/editor_up/18761241861.pdfIn PDF document text
    • http://land89.com/ckupload/files/48058116674.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb1015b52a---59436578976.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/60224906043.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/39531733351.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/99095574900.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/mexafupopupawilawixaze.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/5465870740.pdfIn PDF document text
    • https://carlojans.com/cms/file/futibivozejedazezijosidi.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jotelajifuvorojo.pdfIn PDF document text
    • http://ed-union05.ru/files/file/17016323615.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/zejover.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/kafekekituxegen.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/jimuvurejodoxo.pdfIn PDF document text
    • http://erimti.com/userfiles/file/zemubutodusotofupos.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/3785060692.pdfIn PDF document text
    • http://rococosofa.com/files/files/86487834839.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/binewadumiroxevute.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/vasemakilewonag.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/wokozemurejisepeketarada.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/97733069207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=my+hero+academia+heroes+rising+movie+watchPDF 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_off0000c9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 11028 bytes
SHA-256: 90b68b7bb7931ca51bbbd17e30372577d14ce9f96a99b86b1e8a0c19c6e28560
font_02_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 19408 bytes
SHA-256: 3cfe96fdab9fe43150d9e29b7bfef631ad287e2faef71912d871a8681c8aebc7