Malicious PDF — malware analysis report

Static analysis result for SHA-256 7badf1f13936d26c…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 23:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a4c8faaab0e5977f58c6dee591d1b3a SHA-1: 114f4cbee9ff5448d027424cad21a6cc68a4f295 SHA-256: 7badf1f13936d26c3b4d76b7ad687499f2fd28944d83c8dde28b3484aa5e9663
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=alternatives+to+testflight+for+android PDF link annotation
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0d812f13---33596624013.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/buguxolipuloronakax.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/28392311678.pdfIn PDF document text
    • https://seerupit.dk/assens/file/79721263424.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/35693630259.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/zadexufoliguxugewuxobo.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/49090369899.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/lubivudaremewivagikuw.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/37173552597.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/xiterake.pdfIn PDF document text
    • https://htchninc.com/d/files/segivaxujivusetemonabo.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/suwutusexujelaruwiwiwa.pdfIn PDF document text
    • http://cabini.it/userfiles/files/70880084032.pdfIn PDF document text
    • https://ksuskalology.com/images/file/20378098245.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/musefeloviwepufufenafunu.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/4484647941.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/bowizuxomezafutoril.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_off0000b88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88A 10680 bytes
SHA-256: f8cb4aa51bfafe8a8333d1dc1ba1468d74d0d986f7e89e8b760fffcf68b0e4ed
font_01_sfnt_off0000d0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C3 17236 bytes
SHA-256: aa7d1271a60fd44f61fdcb736822f6dfba5e68b67164fb350b1389e1be6610dd
font_02_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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