Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf64333a6822510…

MALICIOUS

PDF

125.0 KB Created: 2021-04-11 13:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: ec3fe9f426ce50588cd9baf11b4cfb94 SHA-1: bab1baea2ffb1121d64b16b2cfa2997a733d44f5 SHA-256: 8bf64333a682251011c17c05847b2b531e1f88b711cda8a74b6e23c957c7de26
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://architecturaldesigninc.com/sites/default/files/sujuxot.pdf In PDF document text
    • https://www.termis.org/system/files/webform/53478461308.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/kepasibadugemefobovabo.pdfIn PDF document text
    • https://www.jts.org.jo/sites/default/files/webform/96043924660.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/zateguzafafidefezibexe.pdfIn PDF document text
    • https://www.natsihwa.org.au/sites/default/files/webform/lavajaruzapelusudixavu.pdfIn PDF document text
    • https://web.liderpapel.com/sites/default/files/webform/kivalin.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/85138354947.pdfIn PDF document text
    • https://www.blplegal.com/sites/default/files/webform/vogelunejubujapezidugave.pdfIn PDF document text
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/dakatiwilu.pdfIn PDF document text
    • http://cicatsalud.com/html/sites/default/files/webform/mulakipezumaxusilexuvu.pdfIn PDF document text
    • http://cicatsalud.com/html/sites/default/files/webform/604022749.pdfIn PDF document text
    • https://www.pharoxglobal.com/sites/default/files/webform/balulata.pdfIn PDF document text
    • https://www.dgs-interparts.be/sites/default/files/41094691834.pdfIn PDF document text
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/keborezuvefubivuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=%25D8%25A7%25D9%2584%25D9%2588%25D8%25B8%25D8%25A7%25D8%25A6%25D9%2581+%25D8%25A7%25D9%2584%25D8%25AA%25D9%258A+%25D8%25AA%25D9%2588%25D8%25B8%25D9%2581+%25D9%2581%25D9%258A+%25D8%25B4%25D8%25B1%25D9%2583%25D8%25A9+%25D8%25B3%25D8%25AA%25D9%258A%25D8%25B1%25D9%2584%25D9%258A%25D9%2586%25D8%25BAPDF link annotation
    • https://gradfutures.princeton.edu/system/files/webform/42179508969.pdfIn PDF document text
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/8342566550.pdfIn PDF document text
    • https://www.healthdata.org/sites/default/files/resumes/jojilekavoxojomoz.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00019ac7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19AC7 33136 bytes
SHA-256: 614579997dd67e9f84287d72aa61e7272e10a12f79880745d40df6e23d9868b0
font_00_sfnt_off00015284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15284 3396 bytes
SHA-256: 11f6e6e7486fb56e1c1a6a161460869059af7727a1b3c209816032ce5b1596d8
font_01_sfnt_off00015d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8C 9544 bytes
SHA-256: 60b41c810a2216c04e1595007920490731cbd65380c93d0619ba8d6c7b276387
font_02_sfnt_off00017e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E16 18480 bytes
SHA-256: 73af969ce8adf591efb1eef1f9eba0b06571327b83c65fc92ca1117abd9dba8b
font_04_sfnt_off0001d464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D464 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361