Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbba01fa049de61…

MALICIOUS

PDF

70.6 KB Created: 2021-03-26 10:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 563218dc1ad4435fc5b2890e27821680 SHA-1: 7cd18b0988df7ebdd01ef23be0dc506fcf953084 SHA-256: dbbba01fa049de61cc0efa9a6375afa888ad4a7b5b0437ecdb571e9e91e24fe0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://zajinet.ru/strik?utm_term=how+great+thou+art+lyrics+hymn+lds
    • http://carishr.com/12510676412zswgf.pdf
    • http://i-men.ru/realtek_hd_audio_manager_windows_10_download_filehippo77na8.pdf
    • http://komarovskii.xyz/pigewijshvgr.pdf
    • http://paruweropu.iblogger.org/sizinawono.pdf
    • https://cdn-cms.f-static.net/uploads/4384152/normal_6051406956cbd.pdf
    • https://cdn-cms.f-static.net/uploads/4450430/normal_60595a2266415.pdf
    • http://politach.com/36888498488ljtaz.pdf
    • http://santand-es.com/warorijowi7fnm.pdf
    • http://vixilebi.iblogger.org/88358147086.pdf
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5ffdee95cb0e8.pdf
    • http://feruwikabi.iblogger.org/sasewalubijezujewufenuzal.pdf
    • http://albl.ru/593962678456wari.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_59a6044e1bd64c1b98d032aaf185bf05.pdf?index=true
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_4dc2731b327b4426b6eeb0fbf5123475.pdf?index=true
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_7d94874eb0884f0ea5ee706b2e99596a.pdf?index=true
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_18572d6c253643259d8135f7c3a5ea2a.pdf?index=true
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_c71140dea37941248db12de4cace85c0.pdf?index=true
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_52ca0d43a5a249a3a85416125a3bbcec.pdf?index=true
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_c0ea0977b7ac40cca584480c3f04f390.pdf?index=true
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_c6660b6795764f159ed48e28555d0985.pdf?index=true
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_73380f70cea84fa4bc976207ceb389a2.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_off0000d62c.bin
2cc97c7841c967f52791c583f2f3ccad9554bf64cef7b87e5b25c6ff605ad505		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 5508 bytes
font_01_sfnt_off0000e8d3.bin
8c84cbaa6b8ae44000c24f867298358236008e33a257c116be71734587d5b0bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 10632 bytes

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