Malicious PDF — malware analysis report

Static analysis result for SHA-256 c001cb21967025ab…

MALICIOUS

PDF

81.4 KB Created: 2021-03-28 08:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f34a08901f9b07ee19971d22b9eb3f52 SHA-1: 83e1ed10d96890981cb858a3673a123e0753d63c SHA-256: c001cb21967025abf449f2494fdff0a01a851f20ec98c22140614ada9d52d7a5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. While no scripts were explicitly extracted, the presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/wix?keyword=cardboard+relief+sculpture+lesson+plans
    • https://zojufagilazit.weebly.com/uploads/1/3/0/9/130969654/368497.pdf
    • http://normaa-id.com/how_to_get_voicemail_off_lg_flip_phonenjn4v.pdf
    • https://pizotiwedif.weebly.com/uploads/1/3/4/8/134868845/4368992.pdf
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/jokofazaribozomuwuz.pdf
    • http://brightshopbg.xyz/que_es_propuesta_de_valor_brainlyy4t80.pdf
    • https://biligimanud.weebly.com/uploads/1/3/1/4/131454089/1808458.pdf
    • https://zunitilamurako.weebly.com/uploads/1/3/4/5/134529552/7698f3f.pdf
    • https://cdn-cms.f-static.net/uploads/4476446/normal_605ef5842dcac.pdf
    • https://denogowozule.weebly.com/uploads/1/3/5/3/135326247/ebe575f677992.pdf
    • http://fbdirect.site/a_critical_survey_of_indian_philosophy_free_downloadrc8kt.pdf
    • https://static.s123-cdn-static.com/uploads/4387046/normal_5ff2f08195090.pdf
    • https://cdn-cms.f-static.net/uploads/4366398/normal_604353d240c02.pdf
    • https://cdn-cms.f-static.net/uploads/4389616/normal_60286df63a3a4.pdf
    • https://fimiximokizo.weebly.com/uploads/1/3/1/3/131384127/jazesenurudoz_bipabaj_makupokogumogi_tudiwi.pdf
    • http://wonder-ita.fun/5183523932316tk3.pdf
    • https://menedufigejit.weebly.com/uploads/1/3/1/4/131482930/7406331.pdf
    • http://acupofjacob.com/37461143790oxl51.pdf
    • https://jaduvobawitirok.weebly.com/uploads/1/3/4/3/134398576/3434041.pdf
    • http://runolive.com/login_page_html_templatemnj3u.pdf
    • https://buxiwizekekaxe.weebly.com/uploads/1/3/4/6/134662233/vuzomilikejaruvegan.pdf
    • https://pazunorafozide.weebly.com/uploads/1/3/0/7/130776571/8b231a.pdf
    • http://olivamebel.com/agence_d_interim_informatique_bordeaux095j0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48c.bin
a5d097b4d7f1ca395214102b921b3e1f1809fe39088834a997ec691266aed891		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 5196 bytes
font_01_sfnt_off00010641.bin
a58b70be993f4760aec4525713d09ab2b3d1e3fe9ccdb2f3a96ef723564d4ab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 10536 bytes
font_02_sfnt_off000129d6.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129D6 4324 bytes

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