Malicious PDF — malware analysis report

Static analysis result for SHA-256 028503bc7bc058eb…

MALICIOUS

PDF

79.3 KB Created: 2021-09-21 04:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b3f0b696d6de664706033489441a5f44 SHA-1: c3be105893aaeacda8d755a4faecfc9d47504801 SHA-256: 028503bc7bc058eb2ffc2cd8c6487b26295bb5430c481b99cdacebe0db96c838
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 identified as a phishing trojan. The heuristic analysis indicates it functions as a link farm, containing numerous external URIs pointing to disposable hosting, likely to distribute further malicious content or phish for information. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=how+to+move+songs+from+phone+to+sd+card PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161492eda754e4---85171384523.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/pukirudobod.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/6153166342.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6137dde4e0375.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/tafizakemutefufubub.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109011052107730.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/58986432350.pdfIn PDF document text
    • https://visualarchive.bg/files/fajerulefos.pdfIn PDF document text
    • http://trivio.it/userfiles/files/66256684588.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h4olc9hl0j60rtnc2o3ikjt6b4/moxokadiboraroxejeno.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/c1bb2d73950242ed7884d3528e571bf3/37614554110.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/39062518496.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/58037529667.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/44270015314.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/surijufo.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/xomebosokezibof.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/76992986395.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/rarubuzojerowib.pdfIn PDF document text
    • http://aweibel.com/Photo/file/nalabajen.pdfIn PDF document text
    • http://hasyo.net/files/file/45523235928.pdfIn PDF document text
    • http://klpa.net/userData/board/file/6634800093.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/62830489093.pdfIn PDF document text
    • http://linza-market.ru/upload/files/jufefijekupuxelemel.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/76513634232.pdfIn PDF document text
    • https://bevillelecomte.com/ckfinder/userfiles/files/24337356930.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_off0000d06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06D 11072 bytes
SHA-256: 6f9983802a31ea914af475b4283990662159b6c09dd37c499086eadf8ce78f08
font_01_sfnt_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 17728 bytes
SHA-256: 4c5df35f682732c494d4fd4717f8ab1b89d3d126f014b3b4b3866618a11ecacc
font_02_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1