Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25a65707a25e421…

MALICIOUS

PDF

83.7 KB Created: 2021-03-17 07:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7c276efebad780c7255696bbf3b3b8a SHA-1: 43d4c3db6ffad91b9d26b1ef1d24d2bb35d99d7b SHA-256: a25a65707a25e42131f23218c4934b813dcc33751dcc091c04d0818d58ceb1cc
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 phishing or malware distribution lure. It contains a significant number of external links, including a specific URL pointing to 'kuzutuzo.ru' and another to 'juvizex.sportsontheweb.net', suggesting it's part of a link farm or SEO manipulation scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to redirect users to potentially harmful content.

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-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://kuzutuzo.ru/wix?keyword=g4+strain+weed
    • http://juvizex.sportsontheweb.net/slater_s_rule_practice_problems.pdf
    • https://cdn.sqhk.co/nepajenine/fjiibia/diffusion_potato_lab_report.pdf
    • http://zopokujejisolan.getenjoyment.net/genetica_molecolare_umana_zanichelli.pdf
    • https://cdn.sqhk.co/takejirasomu/6gfdhbC/86144666805.pdf
    • https://cdn.sqhk.co/xuvuxemoguf/4geshgT/7787118549.pdf
    • https://cdn.sqhk.co/xewasejeve/dicicja/81823625601.pdf
    • http://sibatike.getenjoyment.net/are_runts_candy_gluten_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d1ae321d-7338-4868-9654-01a259ccdb6b/how_to_convert_procreate_to_vector.pdf
    • https://uploads.strikinglycdn.com/files/68eb7f99-88cf-47be-85b3-beafc07524bd/how_to_calculate_the_power_in_physics.pdf
    • https://uploads.strikinglycdn.com/files/06ab531a-cd66-42f0-9e2c-5fbd4f9dc639/wobixozolok.pdf
    • https://uploads.strikinglycdn.com/files/7e5b2984-f7e5-4c7c-a4ed-391de330c3ae/vodojugosigikixorupefe.pdf
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_95dafced72934034ad113e5a2f1b1be9.pdf?index=true
    • http://padusij.onlinewebshop.net/networking_devices_and_their_functions.pdf
    • http://telusomabufa.onlinewebshop.net/59291667280.pdf
    • https://uploads.strikinglycdn.com/files/f9a8b1f5-3c99-4940-bafe-1ba5530ba751/best_weight_watcher_scale.pdf
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_e591aa1d53604f4e958215b45511a9f1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/14cb7fb0-087c-4f00-9957-ae4b4fc1f173/briggs_and_stratton_550ex_140cc_parts_diagram.pdf
    • https://uploads.strikinglycdn.com/files/2061a007-6624-4be0-a495-6984435d3739/netgear_wnr2000v5_specs.pdf
    • https://uploads.strikinglycdn.com/files/91e0e4d6-0187-47b4-aac8-0ebf47f7e7fb/best_red_light_therapy_on_the_market.pdf
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_e6b473b813514c93b183b0d84e47b0a8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9b9590fe-8aaa-47ca-a9b6-183aeb512be8/how_do_you_sue_someone_in_australia.pdf
    • https://uploads.strikinglycdn.com/files/3c7c5330-5df3-47c6-b078-493fee78f0ab/why_human_experimentation_is_important.pdf
    • https://uploads.strikinglycdn.com/files/c66c70e8-144d-4235-9af6-7b5472c1801b/the_very_best_one-minute_mysteries_and_brain_teasers.pdf
    • https://uploads.strikinglycdn.com/files/f8d1325d-5af2-488a-9d22-d664c502a527/92058067584.pdf
    • https://uploads.strikinglycdn.com/files/b17fdf30-97df-46c4-a75c-8b735e1e1a86/xigojiruzirawidinogufis.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d0.bin
c212726592a0591a6db6f52ea6ff0819d06132b85835932dd2567a8a29b19a05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 5000 bytes
font_01_sfnt_off000105fc.bin
7c5c634bc68ec1bb1ed3ec3175525623486a47e03c05330659509c2e7ffeb99b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 11032 bytes
font_02_sfnt_off00012bc5.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC5 16204 bytes

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