Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9c1471ab767dd9…

MALICIOUS

PDF

75.6 KB Created: 2021-03-17 17:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc32311f7627168d81cc8f98d246b70d SHA-1: dfbcfc025e48297fa2aa97e5c7c826b4e85a8e80 SHA-256: 9b9c1471ab767dd98db08f29aad07c778eb6313297bda3c33d3f527bead8ab73
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, indicating a potential link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/strik?utm_term=dayton+pallet+jack+rebuild+kit
    • http://instapriz.online/putusa3yz59.pdf
    • https://vekatofe.weebly.com/uploads/1/3/0/7/130775682/3578872.pdf
    • https://turuposuka.weebly.com/uploads/1/3/5/4/135400354/wurowopasokovenope.pdf
    • https://nedalejurozawo.weebly.com/uploads/1/3/0/7/130776692/23b61ff8f.pdf
    • https://gafewifem.weebly.com/uploads/1/3/1/3/131379815/fuwadirujebo-midemu.pdf
    • http://mavogevuz.getenjoyment.net/the_crucible_act_3.pdf
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/8daf16fe990ef5.pdf
    • https://kunuxuzuvedenax.weebly.com/uploads/1/3/6/0/136051690/gazigaratupukaj-goxomi-jokumipinel-guxubedu.pdf
    • http://bukawavado.medianewsonline.com/toshiba_code_for_universal_remote.pdf
    • http://robinmani.site/34495915053ykvo7.pdf
    • https://texanajak.weebly.com/uploads/1/3/4/0/134018539/nujapux.pdf
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/wudefesuvonozi_sazuruke_zakofidadarod_xowol.pdf
    • http://nemagufi.mywebcommunity.org/19389005566.pdf
    • http://larokamexi.sportsontheweb.net/is_it_not_written_in_the_book_of_jasher.pdf
    • https://zasiranel.weebly.com/uploads/1/3/4/5/134507270/408097.pdf
    • https://sefidobove.weebly.com/uploads/1/3/4/3/134320077/digab_kireforubeli_moligabotofula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9533afc0-3517-45a3-b191-963a186fcdb3/ranisovanabet.pdf
    • https://uploads.strikinglycdn.com/files/4198465b-b91d-4b20-b484-054d6f3565b3/quantitative_research_design_in_nursing.pdf
    • https://s3.amazonaws.com/tufujifinobiro/13940133927.pdf
    • https://uploads.strikinglycdn.com/files/be81531b-a70b-46c0-86c1-55559d065930/20983300885.pdf
    • https://uploads.strikinglycdn.com/files/ea6087d1-b9b2-4afb-b3a2-b5f48bec7c94/how_to_learn_interior_design_software.pdf
    • https://s3.amazonaws.com/nelizenejakarug/binding_of_isaac_afterbirth_cheat_engine.pdf
    • https://s3.amazonaws.com/xiwevitox/cornerstones_of_financial_accounting_3rd_edition_solutions.pdf
    • https://s3.amazonaws.com/vebisop/kopivematuzuvegofavevuwa.pdf
    • https://uploads.strikinglycdn.com/files/5e089154-959f-4660-9949-d70862f6d78a/nugolexasi.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_off0000e872.bin
8ccc932a8c7e2dab0a4ce6c68fdef6d84fd083b77903cb3d11cd8dd7a9f110f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 5272 bytes
font_01_sfnt_off0000fa7d.bin
0ec25db07c6f0caefb397fd99411792571245465f6ab5998f9fb264f4a0d0a46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 11264 bytes

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