Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb2dba9da702f17…

MALICIOUS

PDF

66.0 KB Created: 2021-09-28 08:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebb93f4678794daf0b76f78907a04f55 SHA-1: ee827d08b8697082c207ff19f38f618ede44b388 SHA-256: dcb2dba9da702f17c7bd20eb35fccd5457bd1e143c2288f7883387545b849f1b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, supporting the attack pattern. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=minecraft+for+ppsspp+download PDF link annotation
    • http://travelspace.pl/userfiles/file/35220914978.pdfIn PDF document text
    • https://dernek.daynexdemo.tk/upload/ckfinder/files/75492043564.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/4303902510.pdfIn PDF document text
    • https://aneri12.eu/res/file/baxivafavo.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/soxevubexumigixetuku.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/97488038569.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/88142345870.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/60423871948.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/9089477760.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/62093931904.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/85135827982.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/62859222475.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/vesowelibixi.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/banik.pdfIn PDF document text
    • https://majubesar.info/contents/files/8814842094.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/luxobibaro.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_off0000a629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000be3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3B 14660 bytes
SHA-256: 60a5112538c55011e46d52f6c5356ea8b962321601864e01ef8ef1d37ed25c77
font_02_sfnt_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 10692 bytes
SHA-256: bff0c512154c4791132ddcb4870093a2b8c3cecb6cbda9f6388efd09684687fb

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