Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0ec82a2f5b3aac…

MALICIOUS

PDF

89.6 KB Created: 2021-04-01 07:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 829548d158dff76274cf0f0cede72f38 SHA-1: 74e204b6b3409ca6b90bfa5cb8b139ef5265e73b SHA-256: aa0ec82a2f5b3aac0420e14e55163f0efa05f0f278f3e68ea5a933dd5ff945cd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating a phishing or trojan threat. It contains numerous embedded URLs, with several pointing to disposable domains and link farms, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure indicate an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=simulacro+de+evacuacion+2020+idiger PDF link annotation
    • http://pycnidwzxc.info/neburapodubu3th4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481156/normal_5fcebe334e055.pdfIn PDF document text
    • http://aycotoro6.xyz/80812003698n943s.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/ihbqhfm/39865175107.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/2001_honda_civic_transmission_rebuild_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/cEmjajd/sling_blue_channel_list_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/xedomobedusi/jgifEja/block_fortress_apkpure.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/51281807436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_6038de2a60995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_5fd671df77663.pdfIn PDF document text
    • http://detonicinitalia.website/31109076387fw9d3.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/jhihuQC/brasfoot_2019_atualizacao_janeiro_2020.pdfIn PDF document text
    • http://reawolt.online/2026496389251s0c.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/eFjagii/juicy_jelly_fruit_candy_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bomifabipi/98134206982.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/brioche_bun_nutrition_information.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/61452281370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0780227-d113-4dba-9eff-d129fd25bfc2/mcp61pm-hm_nettle2_bios_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f30f909e-197b-40da-8085-5416f7d04aca/93417527735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9cc53f-5197-401f-b519-88d57e14db61/25148233916.pdfIn PDF document text
    • http://pigumomibi.onlinewebshop.net/blended_words_in_english.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 5320 bytes
SHA-256: fbf78d1c70de8ba665498c2a3c3bf456eae31f1f471d0b865c933a331c6efbc7
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 2992 bytes
SHA-256: b7bb7b11093fa0aee20e8e99eb39b9debe33419876ca0546710436475cef5f96
font_02_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 12376 bytes
SHA-256: 1dd1a6d20200c3d80afa65fa58e97225f3309afe34a71b063bd9d0528d9073c5
font_03_sfnt_off00013268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13268 16384 bytes
SHA-256: deed1b935c8eeaab94f58489f843501a58ddb5225e4ec218a1c3762d6ef31e7d
font_04_sfnt_off0001485c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3