Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4006e04ca13f7f…

MALICIOUS

PDF

81.0 KB Created: 2021-04-15 03:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 776184b5f1f513b1b832bc03aeaf238f SHA-1: 9bed0a15073824e91e4da2e74da915ea66ac3b8a SHA-256: 1c4006e04ca13f7f06dd3ee30681bd2f0fc33c0696b08cedd04760043aef98f0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://jumiwimov.ru/strik, suggests a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the presence of numerous external links and the ClamAV detection as Pdf.Phishing.Trojan strongly indicate a malicious intent to redirect users to potentially harmful content.

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://jumiwimov.ru/strik?utm_term=what+are+the+rays+of+the+sun
    • https://cdn-cms.f-static.net/uploads/4471688/normal_605c459e61d98.pdf
    • https://cdn.sqhk.co/jepipovi/jfgfhiV/74759697506.pdf
    • https://static.s123-cdn-static.com/uploads/4389581/normal_6007af9390d0d.pdf
    • https://cdn.sqhk.co/vadafepagij/jhjdhiI/dwayne_johnson_koipati.pdf
    • https://wexipemeb.weebly.com/uploads/1/3/4/8/134860193/nofovirelufovikeb.pdf
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/69af329a908.pdf
    • https://cdn.sqhk.co/papazokixe/ghhgWRO/voicemod_soundboard_free.pdf
    • https://cdn-cms.f-static.net/uploads/4427103/normal_6026d644c001e.pdf
    • https://cdn.sqhk.co/podidiwi/xielhi4/criticism_of_grammar_translation_method.pdf
    • https://cdn-cms.f-static.net/uploads/4392441/normal_5fd244ad57d2f.pdf
    • https://cdn-cms.f-static.net/uploads/4415946/normal_602cdd3f4f44e.pdf
    • https://cdn.sqhk.co/getabemuto/3kBYjQA/befiborovixiruxogu.pdf
    • https://cdn.sqhk.co/ketusugedi/jJVghja/xebaxa.pdf
    • https://takozuvixisuwet.weebly.com/uploads/1/3/4/7/134716687/tapulorobaben_xerirew.pdf
    • https://cdn.sqhk.co/vurifozi/jjhiugc/10174990230.pdf
    • https://tuberosaguxe.weebly.com/uploads/1/3/1/4/131437792/vozajojugebud.pdf
    • https://cdn.sqhk.co/bomumuxa/2MAgfgg/wiwozoni.pdf
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/patulaxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bejenosugede/wonigonowogedogotorurud.pdf
    • https://s3.amazonaws.com/sirilagewuga/fonuwunewoj.pdf
    • https://s3.amazonaws.com/pibajuwi/python_setuptools_extras_require.pdf
    • https://s3.amazonaws.com/nilafafakem/sapifivipi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d8.bin
6820a7826979a63b59957daaec5e1f5202caec3b293e21e4fbfca34005707eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 4772 bytes
font_01_sfnt_off00010215.bin
3a60e77634d616f19c8041ab1baa3037ef54a50eb6cd4fab747a2897c5f88f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 11284 bytes
font_02_sfnt_off0001288e.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1288E 4324 bytes

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