Malicious PDF — malware analysis report

Static analysis result for SHA-256 c645d0847b383e87…

MALICIOUS

PDF

87.0 KB Created: 2021-03-26 17:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4738bc0a5a1dd159e773f84cbebbac70 SHA-1: 734d8dd75e6d36cf49e15e782903f85dc7aae7ba SHA-256: c645d0847b383e87051700ba096260f0bbe20172cc3ce3e8136692c0a0f86fc9
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with a significant portion hosted on disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, and the presence of embedded URLs further supports the lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/123?utm_term=estudios+epidemiologicos+experimentales+pdf
    • https://cdn-cms.f-static.net/uploads/4469374/normal_603572b8295bd.pdf
    • https://dejaxunex.weebly.com/uploads/1/3/4/3/134318563/1213642.pdf
    • http://rodsfish.club/sydney_secondary_college_blackwattle_bay_campus_uniformeymdj.pdf
    • https://nafuvazufu.weebly.com/uploads/1/3/1/4/131407552/7943283.pdf
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/logiwe-zidibevozajo-soxajumugositem.pdf
    • http://reduslim-ufficiale.website/319780458780uhli.pdf
    • http://pumba.fun/cassette_to_cd_converter_software_freewug6u.pdf
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/aa9b16ddf17b4dc.pdf
    • https://cdn-cms.f-static.net/uploads/4490720/normal_604e72c06c401.pdf
    • http://moneyindia.site/povaremubovulojaa88ov.pdf
    • https://cdn-cms.f-static.net/uploads/4405953/normal_6048c5227bcdc.pdf
    • http://mixit.info/567944851881c9y0.pdf
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/kupig.pdf
    • http://esportzmlevent.com/ejercicios_sujeto_y_predicado_para_pnwme2.pdf
    • https://cdn-cms.f-static.net/uploads/4385880/normal_60396c956bd9e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xufujofaleki/adobe_acrobat_reader_version_8_free.pdf
    • https://uploads.strikinglycdn.com/files/e8e59977-c660-48ed-aca6-1c037c6da7ab/kogosezu.pdf
    • https://uploads.strikinglycdn.com/files/6bd79f77-baa3-462a-a41f-9722bd9144b7/documentary_letter_of_credit_example.pdf
    • https://s3.amazonaws.com/tajimipojimo/english_grammar_check_app_for_android.pdf
    • https://uploads.strikinglycdn.com/files/a4960ac6-b84b-41a4-b13c-18cdc1df777e/how_to_reset_verifone_mx925.pdf
    • https://uploads.strikinglycdn.com/files/80c33cca-6d0e-4d1a-a079-1d2f33469678/35215016998.pdf
    • https://s3.amazonaws.com/kozibowisenatu/appium_desktop_for_windows_32_bit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fde7.bin
5ee270679f064ec9461c4ffb8f14050e2a6c1f97c9eb36a6147587f1a0d95ebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 5500 bytes
font_01_sfnt_off00011096.bin
2bdb20712a169fb2ad8dbd1fdc63cc17dbf3bdc4da52f1045351330d132f0b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 11788 bytes
font_02_sfnt_off000136fb.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136FB 16204 bytes

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