Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dae256a0dc4e2a8…

MALICIOUS

PDF

74.8 KB Created: 2021-09-10 17:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 13ab15877d38aa581efb66b208babc40 SHA-1: 08ded4b1ce6c68f60785f67d1d53c84a9fc0aeb2 SHA-256: 9dae256a0dc4e2a8164f1396ad9211f4983571b38ea62dfd108fbddae2832763
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, common in phishing campaigns.

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://crysiq.ru/uplcv?utm_term=hack+app+apk+no+root PDF link annotation
    • http://fourfoods.com/images/files/32928279439.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/21976650458.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/42051935940.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/zubodupulefa.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/zazoxirusilutu.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/93714412115.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/bexubulolonobubidijox.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/verogesal.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/netewote.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/94034234052.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/36381920224.pdfIn PDF document text
    • https://hinaweb.com/upload/file/70186189388.pdfIn PDF document text
    • https://ratodua.com/contents/files/99995724468.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/vidutugaris.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/8520157680.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/39267860674.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/98944315657.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/dupufiv.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16137facfae7e1---98091789567.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/masikaluvenojorovobu.pdfIn PDF document text
    • http://tavio.su/files/file/mawoliperi.pdfIn PDF document text
    • https://ms01bet.com/contents/files/rozobakobajozidu.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/52560123860.pdfIn 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_off0000c996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC996 10012 bytes
SHA-256: f04669c25347545d18eccca212e7c196ba8093e2aaf0ba4156a203b2b7bbe5d1
font_01_sfnt_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 17404 bytes
SHA-256: 3d7d4f90ef60a8d3026bc52078c18417ea11d2cf5c66feb8460df8d4ca23e15f
font_02_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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