Malicious PDF — malware analysis report

Static analysis result for SHA-256 376eb4d4d29ef541…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 19:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d59b04d9679c18b36b0f9a4d989df476 SHA-1: 0eef65f74613546435cf336d199633b06addc142 SHA-256: 376eb4d4d29ef54148529066ce57016ff3c917e862c86698893b069f333dc2df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable hosting and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=set+sd+card+as+internal+storage PDF link annotation
    • http://yevres.fr/ckfinder/userfiles/files/20472833419.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/20056183751.pdfIn PDF document text
    • http://getdol.com/page_data/file/35308064032.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8a7d99a28---xajozopagedum.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/vapimufidewusiwujururu.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/30970094897.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/76232812388.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/44043361452.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/15954252976.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/54918697602.pdfIn PDF document text
    • https://netlandschool.cl/files/faxizupitobutejorogimuvi.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/65861839937.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/vezutojisokilitoxepuzo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4a5700ee7---lesipowumoxex.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/xowigiwumu.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/35283938959.pdfIn PDF document text
    • https://orrizon.ru/images/file/jerudi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/zujewiluk.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/19122595439.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/novazodarezodugatuv.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219152146267030.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/82157499685.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/35265163165.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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 10620 bytes
SHA-256: e8a199f078ba2222b43ea6d31453da70b0c2d269efa2bdfa9eed163818b03181
font_01_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 17744 bytes
SHA-256: eb2018ffaaea47632df72ccad320c5754780a9a7d7978e95be25f4380ec2c7ea
font_02_sfnt_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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