Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bad843bdf9976b4…

MALICIOUS

PDF

95.4 KB Created: 2021-04-11 09:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02bc5740424642eefa11693bd5823c32 SHA-1: 2464b020f222cb3a9b9b0b7fdd1a71f5ff0ab175 SHA-256: 1bad843bdf9976b4a754a9903a48bb36c31293edf3baacc053343dd118b10592
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.muttypawsacademy.com/sites/default/files/webform/vaccines/nojezajewi.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/ziseriwutekezarog.pdf
    • https://ambrose.edu/sites/default/files/webform/7968200385.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/72664382884.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/bekam.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/nuwirofu.pdf
    • https://ambrose.edu/sites/default/files/webform/nakevatekiviva.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/tekuxegejarikuferibo.pdf
    • https://www.mainephilanthropy.org/sites/default/files/49101071505.pdf
    • https://www.mainephilanthropy.org/sites/default/files/50588642306.pdf
    • https://www.a1touchsolution.nl/sites/default/files/dovav.pdf
    • https://www.woonsocketri.org/system/temporary/webform/bogobovimefegaf.pdf
    • http://spotlight-sites.com/sites/default/files/webform/wokasonexigugeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kenshi+hemp+farm
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/44438097533.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/ruwitik.pdf
    • https://lib.asu.edu/system/files/webform/sikukuditizituxabisezopel.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/xadumiwedom.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/wosevojowavinojefe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001191b.bin
3147ad57e03dc1bcd6b84a6109a37898d172de072fde005512f644ebe5a8aba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1191B 3568 bytes
font_01_sfnt_off000125e2.bin
9008182b9abeff681c3eecf5d42a6a620bf1f7c6c64b5e41061b50fce5c5228f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 5076 bytes
font_02_sfnt_off00013700.bin
2ca0fd4b3ea12b6d79d0b7e0869101e04f1e85c67acd379604093c013fc69d72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13700 12456 bytes
font_03_sfnt_off0001604f.bin
d7dbcefd5a9d087f9dbd48d87e5b82950a900fa0f666d4a1f78598b818f3f613		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1604F 16060 bytes

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