Malicious PDF — malware analysis report

Static analysis result for SHA-256 607d7dfbf9b95158…

MALICIOUS

PDF

96.8 KB Created: 2021-04-03 20:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcfa937bf9c1bef7caa2d5d2049d86cf SHA-1: 786f7a4e7711a0eb9d0fe49b645df74946da1c63 SHA-256: 607d7dfbf9b951586dcf818b00ea8e460d909b904bdec164a1709df9c2c72cdf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=power+air+fryer+xl+pro+manual
    • http://cmbespaceclient.xyz/sasetujesib0lfr.pdf
    • http://wiwajekirutiw.scienceontheweb.net/88695208865.pdf
    • http://jigapenufi.medianewsonline.com/english_speaking_tips_in_marathi_free_download.pdf
    • http://silvanozito.online/ganga_action_plan_class_10_cbse1fgyo.pdf
    • http://xajabuzowa.scienceontheweb.net/nixelunez.pdf
    • http://zawugudumi.getenjoyment.net/sipudeteno.pdf
    • http://mrt-zdes.ru/poutine_chicken_or_beef_gravyyzuiv.pdf
    • https://wewejodoje.weebly.com/uploads/1/3/4/6/134685686/zobamuliv.pdf
    • https://xinorexuvon.weebly.com/uploads/1/3/4/6/134608307/nunupixipadeja.pdf
    • https://givolejemaxo.weebly.com/uploads/1/3/5/3/135345859/3780426.pdf
    • http://reduslim-sitoufficiale.site/world_map_offline_exeq54us.pdf
    • https://lefaxujil.weebly.com/uploads/1/3/0/7/130739779/pisev.pdf
    • http://koteyarn.moscow/38000681660tdagu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4293ac71-3932-4e48-b8d4-63b740a45d5b/frases_do_livro_alquimista_paulo_coelho.pdf
    • https://uploads.strikinglycdn.com/files/5ddc9750-edad-400c-9925-48add760af09/the_elaborate_entrance_of_chad_deity_script.pdf
    • http://bufijonewufo.onlinewebshop.net/wamubuvolodigepiruzajojeb.pdf
    • https://404c0e03-56c4-4888-bb84-d9d32a71a3e4.filesusr.com/ugd/100e2e_7075a91d20ac423fbab6f4116d46b1d1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/91d23770-237a-4e01-86ba-7984a63310fa/98117827209.pdf
    • https://uploads.strikinglycdn.com/files/a233a8f3-2be7-454b-936e-cb27c289a73e/nukezutajupiwidupujuze.pdf
    • https://uploads.strikinglycdn.com/files/58fcfd50-b7a5-4963-8e2a-3bed0bf3eecb/23653095638.pdf
    • https://uploads.strikinglycdn.com/files/fab1f8f8-34a3-4751-bb6c-3e3b79d2194e/navy_stress_management_training_powerpoint.pdf
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_94355fde326c494b9a82ff935a37bb38.pdf?index=true
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_0b0fc225cd34439fae4651ead6ec155b.pdf?index=true
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_656388ca6ebd47b58e516137e38cd412.pdf?index=true
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011817.bin
235351a1344bde38b3651ebc263634e0a9618aa37285faf934adcde6f50b7369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 4932 bytes
font_01_sfnt_off000128d6.bin
6c33931bbe4adaeb72c39db4f3e774a3a83ad384e37e381fc2816f181c6e2f62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128D6 12120 bytes
font_02_sfnt_off0001524f.bin
159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1524F 16140 bytes
font_03_sfnt_off0001674b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1674B 4324 bytes

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