Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f927a0a84443b7…

MALICIOUS

PDF

71.0 KB Created: 2021-10-02 13:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c8f6131e6edca2873d10c2104310871a SHA-1: c057447efba8ab58d86b340fcf4a43aca447f062 SHA-256: a6f927a0a84443b7dba50aeecedaf25377c91bc82915d3944183474786fa8dfd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=third+level+class+12+question+answers PDF link annotation
    • https://zhbiotech.com/CKEdit/upload/files/29585930192.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/tazilujabidi.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/76541422922.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/misiminaxakiredanibodivex.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/10618332313.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/66633861406.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/satud.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16156d98cb3dfb---razunemitusukadupojifepo.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/zuvarolutavemisesogozuju.pdfIn PDF document text
    • http://imi.vc/upload/files/vekenifosaki.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/tubukegel.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109182110547856.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///pazafomotejexogoni.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/61842978694.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/xadaforegaguvuvorofawome.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/pirutusana.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/62762242727.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109201951134345.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/23669936404.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/76843275666.pdfIn PDF document text
    • http://www.perlodrink.com/documents/5167015560.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/77275528967.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/21500616507.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_off0000b32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32A 11000 bytes
SHA-256: 30d6864908bd58f58e44a693e6932243553f798f21146146ce24efed2d7cb252
font_01_sfnt_off0000cc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9B 16288 bytes
SHA-256: 421ab7f3a45ace0ed909ad934bee9375014340587ffe211a1407f7e640dd1b3e
font_02_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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