Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf78b6301cdc89a7…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 14:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 783cb4836cdfa347679dc5a21d07ac77 SHA-1: 067636a4bc0d7fa119c885fa224924ccc6344d33 SHA-256: bf78b6301cdc89a758bda947c55cd66ddd3f599e86659a91c7cb3531ece16947
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, including one with a UTM term, suggesting a phishing or spam campaign. The PDF structure and embedded links point towards a link farm or redirection mechanism to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=free+bingo+blitz+credits+2020 PDF link annotation
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/vevegabeseti.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/21888080491.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210913042145.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/69hln2aoepndm74rn9l6nqb1hp/85886706324.pdfIn PDF document text
    • https://vendax.ro/files/file/50990684870.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/66850303414.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/49857443336.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/20648486823.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/zumofakamurilajaj.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/turoribenomabenitanibo.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/48138109973.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/wawulutusotukojexe.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/tezukamedokasenosa.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/55198294475.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/25054108553.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d4f73c986---71998963861.pdfIn PDF document text
    • https://ptogel2.com/contents/files/resolifenojidifaten.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/datiwu.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/9578135853.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210916053112922271g9fmu.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/56449346112.pdfIn PDF document text
    • https://electroagro.es/pub/files/30191408117.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/62904242982.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_off0000ad8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A4 10804 bytes
SHA-256: c25ddb895683990f08624c5e69512c494522a01a64930ac0ad13390bb009aa51
font_02_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 17084 bytes
SHA-256: 07de9a3806ecb7dfbf6e1eaebfd574dc8f6ab27d5e6cd4c09174b00511388b5c

Open this report in the interactive analyzer, or submit your own file for analysis.