Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7102a7bcfa8f154…

MALICIOUS

PDF

79.9 KB Created: 2021-04-08 11:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cb19a4372755ffd6c7f5f9b89fb74ef SHA-1: 2d6657aec039a9afa8f3e271095cd390fb33a64c SHA-256: d7102a7bcfa8f1542ec12a1e024d7269e8f720f0ecdd1c0db6ef49d74c83bc2e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, suggesting an attempt to direct users to potentially malicious content or phishing sites. While no scripts were directly extracted, the PDF structure and embedded URIs strongly suggest an intent to exploit users through redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=what+is+data+warehouse+definition
    • https://cdn.sqhk.co/zanivuwiduvo/ijecgf0/cubicfun_3d_puzzle_game_of_thrones.pdf
    • https://cdn.sqhk.co/modebopogut/2jghjcD/91868904031.pdf
    • http://acgmgroup.ru/age_of_empires_2_mac_megaol38f.pdf
    • https://cdn-cms.f-static.net/uploads/4455672/normal_600fb0d5d380f.pdf
    • https://cdn-cms.f-static.net/uploads/4391636/normal_6019f22e6752f.pdf
    • https://cdn.sqhk.co/fukofuwuvis/6ahcWhi/12697286232.pdf
    • https://cdn.sqhk.co/togodawexu/cg6PVib/82426108637.pdf
    • https://cdn.sqhk.co/vetejevibas/tMF8gj3/33415232761.pdf
    • http://help-verifiedbadgecenter.com/plantronics_voyager_legend_wireless_bluetooth_headset_best_buyotvwp.pdf
    • http://natikolom.site/fafonasiru5y23i.pdf
    • http://begemot.space/zuvurekunogilabupkfpdq.pdf
    • http://gratoram.site/82887756353uxlzw.pdf
    • https://cdn.sqhk.co/moromasi/5jejcge/11192406299.pdf
    • https://static.s123-cdn-static.com/uploads/4501495/normal_5fc78b5941735.pdf
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/palutagizerijav.pdf
    • https://cdn.sqhk.co/titusegik/jgcOp1n/fashion_star_dress_up.pdf
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/a5c8a546c6c73.pdf
    • https://cdn.sqhk.co/bidusowo/SokibwV/plantar_wart_on_finger_pad.pdf
    • https://goxanakevixi.weebly.com/uploads/1/3/4/8/134857001/mutexaxuru.pdf
    • https://cdn.sqhk.co/duxadikoti/c2geiar/bafixofinenagigexaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cc40790a-b629-4cb2-908c-a1cc35ea667f/jojakezemojerofexitote.pdf
    • https://uploads.strikinglycdn.com/files/2f5abf7a-da3a-463f-aacf-681c45b6cdb7/pokemon_books_online.pdf
    • https://uploads.strikinglycdn.com/files/ab15d298-5da4-4017-98f0-31c0ffc689eb/how_to_achieve_effective_communication_in_nursing.pdf
    • https://uploads.strikinglycdn.com/files/d051f7a5-5015-4e55-99a6-f3bd2e4b9238/zepibogujudaxavufok.pdf
    • https://uploads.strikinglycdn.com/files/69b06e30-1411-4d12-b3e3-aa8b4008e99c/66162808201.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc4b.bin
79212603bef9e9de10269b20793938a3856560830cf7d87edcc0dd8d847fca80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 5068 bytes
font_01_sfnt_off00010d98.bin
8a4a32af4a52cc71202ac3906d4855b542cfa7974316550f2fd5758df894d6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 10676 bytes

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