Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca9fa3a4b33b4ab…

MALICIOUS

PDF

74.4 KB Created: 2021-06-12 23:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f9ec20014d4a9da252947ed5d5e5c792 SHA-1: cc022fb5ff5e137ed523331793beabec69bc8d36 SHA-256: 5ca9fa3a4b33b4ab04ccdb5dc8b7f452fd3849ac722488152393a9788cb1a602
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The document body, though heavily obfuscated, contains references to 'geometric progression formula infinity' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure. The PDF contains a large number of embedded URLs, many pointing to disposable hosting services, which are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://cructi.ru/pbw?utm_term=geometric+progression+formula+infinity PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485714/normal_6051b38ac2094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_6058e2ef52442.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369516/normal_5ffd00777a27a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485702/normal_6021cfa9e425a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392861/normal_5fef0deea1f1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417139/normal_60bc449229c08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_60108171b57fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fca689794e30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_6057a0ff9d2de.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
    • http://zuvevetub.pbworks.com/w/file/fetch/144423285/tolegogamumizewajiwa.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144826659/sodetawitabojagepewidixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/335c8159-fc5b-4c9a-84d0-4554b58c1ce0/37351396484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0178e56b-133b-4a20-8ab5-d18caa22ef55/pikifumoja.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/56106660899.pdfIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144767454/65000769866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ef33ef-6a4f-4f5f-bb88-30531b669861/vinape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99289ee-a76a-4d02-8a44-7b5a6b428033/78827449703.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/f/is_granular_chlorine_better_than_liquid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0121365-3ae1-478e-8e9f-b2c2997f940a/brother_hl-l2305w_toner_reset.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/f/project_igi_1_apk_download_for_android.pdfIn PDF document text
    • http://vevokofeju.pbworks.com/f/67612439985.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 5348 bytes
SHA-256: 6daa799602685c50ba4e6e2d0593a089a0ef3c95430e49553fe5b5d81b6d5392
font_01_sfnt_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 11380 bytes
SHA-256: f0d315eeef647bb6c388950efa980c976d502d0db0e837bf2e416ec8af1b67c7
font_02_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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