Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb64cdd28d768bb…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 10:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c774f62febe08c957d5b8e29e5352e50 SHA-1: 642dbad0b452af786c1b41c28e9d31dade6e3722 SHA-256: ceb64cdd28d768bb59d0006025d39ffeab9f81f77052f190feeae06a758e17be
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number. While no scripts were directly extracted, the PDF structure and associated URLs suggest it is designed to lead users to malicious content or initiate fraudulent phone interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://psychologkmalinowska.pl/ckfinder/userfiles/files/38378630700.pdf In PDF document text
    • http://www.bash.cl/media/file/74255886858.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/nafolulisidotemipulumapu.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/35938536021.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/barotazonifidofilakebapil.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/subukonoluzoberokisusu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/84f5bb4629f787d493a16340ec45991d/fabujizodejunazebedo.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/55703314762.pdfIn PDF document text
    • http://hangquangauto.com/files/xuxofunexodegefironeta.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/31729593870.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/p9pubj18h8togi2rqjqcai72eg/24064889738.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/34645718638.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/74414539603.pdfIn PDF document text
    • https://topupdana.com/contents/files/76552443371.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/wirem.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/64285905095.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/xuzemefediganumesat.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/buvele.pdfIn PDF document text
    • http://inica.org/files/file///divasesom.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/39025959906.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/ragonifodovujito.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/jarabudizabazosaju.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/jinusutezerimepanaxalup.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/88963452819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=blank+periodic+table+printablePDF 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_off0000af66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF66 16812 bytes
SHA-256: 4c103c30a2ad340dc11f5b5180f7065ec7551ccd88e7b5a7c21e0a055e8b3e56
font_01_sfnt_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 10624 bytes
SHA-256: d9cd8b0000c70bd109a0bddb5cfafae20a9350564d7eb24cb408b43ccd2de007
font_02_sfnt_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1