Malicious PDF — malware analysis report

Static analysis result for SHA-256 43582fb510ec0f0c…

MALICIOUS

PDF

88.6 KB Created: 2021-04-10 00:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d01d58d47da3615ae3a4afd3a7fcc820 SHA-1: 97333f3a2b36495998f9cc4fce4c4dc621f7b8fd SHA-256: 43582fb510ec0f0c13af8916d3eb34def57be93ddd9bb021a213c88680f6ec2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and trojan threat. It contains a link farm of numerous external PDF documents, likely intended to overwhelm or distract the user while presenting a deceptive call-to-action. The primary malicious URL identified is https://kuzutuzo.ru/strik, which is likely part of a campaign to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=chicago+electric+10+inch+tile+saw+parts
    • https://cdn.sqhk.co/bitowiso/hbaGja0/57900724230.pdf
    • https://cdn.sqhk.co/nemoludajedu/Aicfhej/33681520277.pdf
    • http://vixabaj.scienceontheweb.net/what_is_the_best_pulse_oximeter_to_buy_for_home_use.pdf
    • https://cdn.sqhk.co/reromiwo/fgegeja/escape_game_prison_adventure_mod_apk_unlimited_hints.pdf
    • http://kutejovanog.getenjoyment.net/zafebodudax.pdf
    • http://bisibometixo.mywebcommunity.org/fikosozasiwuzusatax.pdf
    • https://cdn.sqhk.co/kewixoretuze/hjIfiWP/sickle_cell_anemia_2019.pdf
    • http://mitutepoka.medianewsonline.com/29385587289.pdf
    • https://cdn.sqhk.co/vexelomuveg/cIigkAe/dragon_city_chinese_menu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_92d1556db41c4869a2f2f8fc4c94ec3b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/de69499c-ee9a-48e8-881d-9a6d254689fe/jelos.pdf
    • https://uploads.strikinglycdn.com/files/399773fc-b2ac-4ff4-ab79-396b8dedd65b/how_to_change_an_insinkerator_garbage_disposal.pdf
    • https://uploads.strikinglycdn.com/files/fd27a077-17bb-4677-a29f-dd3acb9aabeb/41330042412.pdf
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_c0aa0f2d9da243e980c47275ca66f419.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e95f2c91-4c87-46ab-8a00-cf4b7ae688dc/bunowibewasozelinalabuvik.pdf
    • https://uploads.strikinglycdn.com/files/3484c975-dd6b-4111-9eb5-c956d4e521d1/joxavibupajegom.pdf
    • https://uploads.strikinglycdn.com/files/20bd0fbc-1a0b-4c4c-94dd-79f553b7c969/trauma_narrative_chapters.pdf
    • https://uploads.strikinglycdn.com/files/a8e791a2-def5-4ccb-a7dd-addd709e4d9d/46232829051.pdf
    • https://uploads.strikinglycdn.com/files/060f4d3b-da1e-4527-ab82-de5f557dbdca/jepem.pdf
    • https://uploads.strikinglycdn.com/files/8ec687dd-c096-4037-92d1-d333a5d6e654/eat_right_for_your_blood_type_b_food_list.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_off0001194a.bin
dc32d4b47135a95a3418d441d36c86ab59b0e13e941f396611db4d127d816628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 5388 bytes
font_01_sfnt_off00012ba8.bin
0da46babb0f9d468ab8382ae592af556dbe35a0508020b24b2c559c00cecac8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 12212 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.