Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2834bdebac54bbb…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 01:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f50e546611ff9dccb46767808bb4b45 SHA-1: 351f15316fe3a524d57c8bcf164bf3a218cd02ac SHA-256: b2834bdebac54bbb28e5d7da8e6c42b313806539b7d44d399b46a000b56b974e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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.
  • 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://perfecthospital.org/ckfinder/userfiles/files/fabiguwusedagumijux.pdf In PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/lobakotowe.pdfIn PDF document text
    • http://retailcop.ca/files/19413114378.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/26867127466.pdfIn PDF document text
    • http://decorstore.eu/upload/file/rabovupuxuvidowur.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/vibofamepowosotabizone.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/58034186616.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/92547282011.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/pefatitosot.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-16/20210916105155666653.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/zajebikurabijakuxawazi.pdfIn PDF document text
    • https://brakos.it/file/62532583470.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf2fde394e---22221524494.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/meguxi.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/13911332672.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/18031461048.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/78323014944.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/zirapefijejinigepoxaba.pdfIn PDF document text
    • https://iohrp.org/f_files/files/50253900887.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/35761831471.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/salusukumokerukezeb.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/wezibejidero.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/25586791358.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/lalibofaxep.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/zinesemujow.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/denumigoketesubixozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wwe2k19+ppsspp+highly+compressedPDF 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_off0000b548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5A 15488 bytes
SHA-256: b037fab963353e15ad5613ec1114ff6c0b10bb5006e3c3b87aefd673297b7297
font_02_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 11220 bytes
SHA-256: 2a97add327b98a3f15da6cdeb5b44cf5c7ec6979dbe38c8145a60fee4c90eb61