Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5c23d9ebd6c3a5…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 15:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c825f917d175f6a6b1ffd9c540934c32 SHA-1: 1a95cb89e6bdf54214b46b13b8b7577e27418c1f SHA-256: 0d5c23d9ebd6c3a5ba9c43ca93beb0e8c60ab8cbd8bf90cec539da56cae98bdc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs pointing to external PDF files suggests a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.ez4parcel.net/upfile/files/2021/09/24/fubonusupave.pdf In PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/8339896854.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/jatetusazomosowubuta.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/fesivezedamufaz.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/peforazadamalafejulesoja.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/sapuvibudixunid.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/3067015584.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/rigufajadopopazidixiweser.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/91255021655.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/numetokinan.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/zeligopexedozinipiz.pdfIn PDF document text
    • https://mkontakt.com/dat/file/81051404098.pdfIn PDF document text
    • https://limsurempat.com/contents/files/sorebazilatasekodila.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/lefizajabiwutipen.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/faxuru.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/54897757265.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/betaratobunorigove.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/lovon.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/defesiwonidamemapelofazes.pdfIn PDF document text
    • https://webhosting4.net/media/file/76661436958.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/36170344564.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6f1422fa3e9eeb8a44acf743d29499cd/63641930187.pdfIn PDF document text
    • https://506hlapeta.com/files/file/39768195596.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/tefadudamojofuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=moto+x3m+8PDF 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_off0000aef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF7 16068 bytes
SHA-256: 7156a1ec470b74dc87ff349079279d6a1f7e3c2ba866f3fe042dc45f57004d90
font_01_sfnt_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 9940 bytes
SHA-256: a3aee01eefae1481cb95531b6dc9db43ebcacd5c2fbccd5dacfc5d1c119418f2