Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da62f17b68be173…

MALICIOUS

PDF

99.8 KB Created: 2021-04-10 05:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26228d4ccfd62915b2aef4cd9dad5e98 SHA-1: 4375e65031e0717a12240ec14aa3127a5d5e6ec1 SHA-256: 6da62f17b68be173d326b5a67acc41b0006f551f4e2045d988ede6ccf5bada62
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 are likely part of a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=dr.+jekyll+and+mr.+hyde+1931+film
    • http://rinusiwujegabu.medianewsonline.com/zaxowojetuxuxamegezoximot.pdf
    • http://lp-consalt.ru/boxomodaa61.pdf
    • http://tejasatobes.medianewsonline.com/44072111790.pdf
    • http://kofupum.mygamesonline.org/48866585638.pdf
    • http://feludekinopotas.scienceontheweb.net/mejosexo.pdf
    • http://universe1.space/my_hp_envy_4500_printer_will_not_printkpfy7.pdf
    • http://itsamorem.com/zenodufuna5iyt.pdf
    • http://jofufunobek.sportsontheweb.net/what_are_different_conflict_resolution_techniques.pdf
    • http://meetsol.xyz/can_you_clean_a_snowblower_carburetor_without_taking_it_apartz2en2.pdf
    • http://tukomibewi.getenjoyment.net/caap_2_examiner_s_manual.pdf
    • http://leyloften.online/wumoszwz4p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ce5d016b-e5fb-4004-af8f-35f61b829e22.filesusr.com/ugd/d7d7f8_13fb4b5ef2d44d77aff26d375f12387c.pdf?index=true
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_89adde5b44534c6ba983962eb37ced5e.pdf?index=true
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_4b8aa6db0b294bebae8783eadcbaa538.pdf?index=true
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_f15a43a68b994a81ae8850a1639faf4c.pdf?index=true
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_e486bc2f9f234f76a35a39661abffdfa.pdf?index=true
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_ec83411327f44affb3b427501bb5725f.pdf?index=true
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_28e488db25c243d59936c932f7a8d27b.pdf?index=true
    • https://311919ef-92bb-434b-a93e-382c1a5e2e65.filesusr.com/ugd/c893b4_bd9317bb88fb4928bfb69f6a72b757ae.pdf?index=true
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_b9265aed1d194965a6e42d9c0f817d5e.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_off00012820.bin
0ad4943bc272728079f09cec987a7a00bae3da2f15f438273a9d8d9b54a3fbc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12820 5212 bytes
font_01_sfnt_off000139b9.bin
3dc7214e172d8c1d93cd8131440311e0553b26ff488b15db387be862a63d494e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139B9 11024 bytes
font_02_sfnt_off00015f7a.bin
d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F7A 16164 bytes
font_03_sfnt_off00017476.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17476 4324 bytes

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