Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad153a22e26af1f1…

MALICIOUS

PDF

75.8 KB Created: 2021-09-09 06:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db68875ab015727400d4ca23b0462474 SHA-1: 97f0b9fb6c232b75507c843d8ff2deaad7b7acc6 SHA-256: ad153a22e26af1f1ecb6e32f07c7540f5d3888fa5b693878312e1c422308beee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=atlas+shrugged+free+pdf+copy PDF link annotation
    • https://strategie-forex.com/ckfinder/userfiles/files/wizijipolomileretifude.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/95089195239.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/31472676796.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109022027454134.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/52227834358.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354aba48ea9---zewalodijojojunel.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/22939002766.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/42059957947.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/vasoromikuv.pdfIn PDF document text
    • http://lachina.cn/upload/file/53529420750.pdfIn PDF document text
    • https://red-adlay.com/upload/files/75155087751.pdfIn PDF document text
    • http://entrackintl.com/uploads/7749382634.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/bovegoralibodemo.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///43017447287.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/piwemujikugidemunetewi.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/ruxomeluzafepawezojez.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/62435130891.pdfIn PDF document text
    • http://aimic.com/userfiles/file/18627621643.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/nufuxuponibaxelujuxeseso.pdfIn PDF document text
    • http://gr-chem.com/upload/files/pukajuzumadivi.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/motinuwamebimugibatuboku.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/munuwakugiwekuliwijol.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5696aadbd9b5a1a825aa007b65c5a20e/satusufadokoweberi.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_off0000c2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F9 10900 bytes
SHA-256: 824906b701b1d2d58c97ec27038000214189ed7685cc8a4072a2fd6a7c3c4a00
font_01_sfnt_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 17408 bytes
SHA-256: 9cd39e7504a84a8f04deb981863fdb859b9187fb35c1344134495e882ca5a96f

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