Malicious PDF — malware analysis report

Static analysis result for SHA-256 409edf6c9edb2eda…

MALICIOUS

PDF

80.3 KB Created: 2020-12-28 12:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4b7db6491b8c7c96bdb6f0dc78e830e SHA-1: d61ab46a2c29caefe69369facf9caaf03c1286a4 SHA-256: 409edf6c9edb2eda8a38a4c7fddedc2783d3bdf0cc3c4cc8a901c3d06264ea05
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, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The primary URL, 'https://traffset.ru/strik?utm_term=survival+guide+examples+ks2', is suspicious and likely serves as a lure. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. No scripts were extracted, but the structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=survival+guide+examples+ks2
    • https://cdn-cms.f-static.net/uploads/4385038/normal_5fa2f469b6ff7.pdf
    • https://cdn-cms.f-static.net/uploads/4465559/normal_5fd78da262fff.pdf
    • https://cdn.sqhk.co/wopidaxiwuk/0dcjiAc/the_world_of_magic_guide.pdf
    • https://cdn.sqhk.co/barugogip/gjiehj5/lajorimigabexipijanet.pdf
    • https://cdn-cms.f-static.net/uploads/4387938/normal_5f962182e6010.pdf
    • https://masudokunu.weebly.com/uploads/1/3/4/7/134731157/2384018.pdf
    • https://static.s123-cdn-static.com/uploads/4404500/normal_5fdff39b771d9.pdf
    • https://luretazolikaxu.weebly.com/uploads/1/3/4/5/134587875/bufikalagugekid.pdf
    • https://cdn-cms.f-static.net/uploads/4419828/normal_5f963855ad514.pdf
    • https://cdn-cms.f-static.net/uploads/4367627/normal_5fe7db4e39576.pdf
    • https://cdn-cms.f-static.net/uploads/4391319/normal_5faa03c1a0368.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rawesaragegugar/lejigowopamere.pdf
    • https://s3.amazonaws.com/gumegulaxi/57115821331.pdf
    • https://uploads.strikinglycdn.com/files/cff24bab-e40a-444a-86fc-423555ceb1c9/invoices_have_been_sent_paparazzi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e696.bin
5787205730a2b458a4710ead6c12a8efc4a55f70025528730f1fa9043810a0d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 5708 bytes
font_01_sfnt_off0000f9f9.bin
ae8633b9b9f41fb9aefc5d333717f59fe2d06136db138a5b99599948d207f580		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 10728 bytes
font_02_sfnt_off00011ed3.bin
9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 16096 bytes

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