Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f9ebe5ebe139b2…

MALICIOUS

PDF

78.8 KB Created: 2021-04-05 10:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 008b06e4b6ef01d0022ea315024e7b32 SHA-1: 51fe05b86ba56d723da2b8db9cfccf9e1e749941 SHA-256: 63f9ebe5ebe139b2da5a6cd1dd1de78a58d51b534ef7f7232416885e8f0393ac
156 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, suggesting a link farm or phishing attempt, with one URL specifically identified as a potential phishing target. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the document's primary purpose is to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=sistema+endocrino+enfermedades+que+lo+afectan
    • http://makeyourself.xyz/the_summary_of_oedipus_rex_by_sophoclesqsank.pdf
    • http://ses-paypal.com/pivenowegelqz0q3.pdf
    • https://static.s123-cdn-static.com/uploads/4389353/normal_5fccb5e52066c.pdf
    • http://serdyukov.pro/54702350130d2mr5.pdf
    • https://cdn-cms.f-static.net/uploads/4421970/normal_603ccdc158f05.pdf
    • http://ropiwijubasa.22web.org/pipatitanawirurapixeda.pdf
    • http://givepamodugag.22web.org/litumobegivopabixola.pdf
    • http://shishkin-seed.xyz/kuxavoxodinugefaswle4q.pdf
    • http://lnstagramoriginal.com/robbins_pathology_10th_edition_release_datev081c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://selusibe.epizy.com/illuminating_engineering_society_handbook.pdf
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_a6a099546a3d4a7baa833b65dc6bbec6.pdf?index=true
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_33fcd5c412ac40918e553bd18e5bbdad.pdf?index=true
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_76d78c9bfaf34450bcf62301a6a03588.pdf?index=true
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_d64e6f7c55c34841b77045ec98232af6.pdf?index=true
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_9fed5fb38cd7445fae2865e2df10c6cd.pdf?index=true
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_59f13140243747268491ed52dec9528e.pdf?index=true
    • https://8e6fe9cb-6e01-49b8-a8bf-add1d7538daa.filesusr.com/ugd/4e948c_fc1d751ce58e4a2b89d86c961a1bd9ee.pdf?index=true
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_bc100b7451e745b491a4d87a90874582.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f535.bin
c7c56db1dc8615b8364f59ff5effe1faf13bd74290867f0ec1e85af7369b3ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 5396 bytes
font_01_sfnt_off00010772.bin
e7cf82446f206946a8edcccddb94e8e8bf1eaa7d002b70a333a92c28b31fa4ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 11164 bytes

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