Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1aea3beaa87fd8…

MALICIOUS

PDF

111.2 KB Created: 2021-10-05 04:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd3d54e356e98dfa7b9e5854108617b2 SHA-1: f731615414bf78924054bb3aa44a49f683986486 SHA-256: cd1aea3beaa87fd82a61678808824e81e1fa0ae75fa00bb6f0c189b166b734a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://apsco.ly/userfiles/files/30862202565.pdf In PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/dumozaxazenugeb.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/83078693403.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/48588262399.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/88132154731.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/sobafuvuburogobizus.pdfIn PDF document text
    • https://novitas.ro/files/74925998267.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/dozuwirabopuwumopunov.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/31862229207.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202110021029277115.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210914054350.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/58635560694.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140a6cf3eb33---lerujo.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/lowiro.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/92380716363.pdfIn PDF document text
    • http://topas.lt/userfiles/file/faxeg.pdfIn PDF document text
    • https://najemwroclaw.com/userfiles/file/lerunugibinerevufu.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/moziduwepanefado.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/4138273267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dragon+ball+xenoverse+2+new+update+release+datePDF link annotation
    • 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_off000147cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE3 11092 bytes
SHA-256: 63c031fcdfac5ef02b472ec01618812f1742b22da9e5524a6c56381720a4a1ca
font_02_sfnt_off0001799c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1799C 20772 bytes
SHA-256: 6a498752d73e7b09101f2400a2c938f3806d43306f31d186b0a96b5feb69706a

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