Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1295cd8bbde76a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 18:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 25775520489937430b344fb43c64bba0 SHA-1: 1aca0e93cc730cd7911d1ca7496966b9e682cd2c SHA-256: aa1295cd8bbde76a1ec628295becb2d5db6dbb7e42692f6ffa1837288e64a0be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://inwebjor.ru/uplcv?utm_term=root+all+devices+apk+free+download PDF link annotation
    • https://hsse.cl/files/sesuvo.pdfIn PDF document text
    • https://granitnet.hu/editor_up/lujaponixak.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/2212705894.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/30873017034.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b885aa55f---davudidomorazikixo.pdfIn PDF document text
    • https://actorconseil.com/files/file/19877257130.pdfIn PDF document text
    • https://krossi.ru/images/content/files/zevonusomesok.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/waxovopurusudowuzasivo.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/kepegebigigoravekifotur.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexesazixikepogaw.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/93642234266.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/66723083409.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/83313364889.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/zujofajob.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/80974515282.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///76242877089.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139fb2d30b7f---lofusimujifojosepaligesop.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/vesevefimefiv.pdfIn PDF document text
    • https://keongracun.org/contents/files/rotuvexokip.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/29085435075.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/fofesesigedoja.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/busesurerageriwosimu.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/64327534433.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/16784893843.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/59722044851.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_off0000b06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87F 15584 bytes
SHA-256: 294b12c0c19c691093a85781bf6ac601a11f453016040239fc59b34b94cded8a
font_02_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 10900 bytes
SHA-256: 9c2146ccbee502026d364634a8230282b33b1dd8904929cba872c02adf756942