Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dfe05ef98ebad4…

MALICIOUS

PDF

70.0 KB Created: 2021-09-20 22:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 543fe00fde6bd329a78b2113d89b97eb SHA-1: c8696e789082e0a02c53b4ebef56eb84434aae4f SHA-256: f1dfe05ef98ebad4fc1ff0848f6de8b3262bf40627b7ace13b93b9755b999014
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure by heuristics, suggesting it's designed to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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 https://pnp-studio.com/fckeditorfiles/file/37980306115.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2878d1cce5cb37a9747313926ff14686/72911308331.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/32437478384.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8bea13db151a6c91b66e345861b6bff0/wadoxijazorepojaxaxadez.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/kasiku.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/wemalanatare.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/kinabudevomibumixexe.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/12676704829.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/vesotanulekekotolesat.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/solibakikezuwizagev.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/17832173408.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/vujubululuxagimow.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/78411315946.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/rikofarumajuxe.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/bakobarezotariru.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/76203734207.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/69314039093.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/wasosusu.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/janejawupusexapemidor.pdfIn PDF document text
    • http://parentini.it/userfiles/files/katozubokodawutuj.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/gelitona.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/9787713236.pdfIn PDF document text
    • https://icbacademy.com/upload/files/62021981352.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/70445100697.pdfIn PDF document text
    • https://unitjaya.com/contents/files/92971589514.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/79933990874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=crazy+chef+fast+restaurant+cooking+game+mod+apkPDF 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_off0000b425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 11420 bytes
SHA-256: 640be1483b3464d1e023d0095ea7b7e89411cf413aa32612417d7381e5289f6b
font_02_sfnt_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 13992 bytes
SHA-256: 369546741f26e34851744a177ff8964d6ea1919d38eb9fd00dc84de7719174ed