Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb0b19fdfa17f0e…

MALICIOUS

PDF

73.6 KB Created: 2021-03-21 06:16:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f491a17f596324d847041f7e4dd2fabd SHA-1: 84d16dbac3caaf0cb67e7eb64dc44428c69662fd SHA-256: edb0b19fdfa17f0ef6fbb350672b8bcf462a3267d1ff38606bae78b3033ec5cc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dafemum.ru/strik?utm_term=sig+sauer+sp2022+speed+loader
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/vafopobug.pdf
    • https://cdn-cms.f-static.net/uploads/4443802/normal_6032d69ea06d6.pdf
    • http://bukapim.mywebcommunity.org/four_pronged_approach_lesson_plan.pdf
    • https://cdn-cms.f-static.net/uploads/4374704/normal_60391e8977510.pdf
    • http://rinujajija.getenjoyment.net/zebofisusejofavewetevu.pdf
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/7051481.pdf
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5fe3162326e6c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gitipelut/drinks_menu_template_ai.pdf
    • https://s3.amazonaws.com/kudowo/96741003503.pdf
    • https://uploads.strikinglycdn.com/files/eb2526eb-1f3a-4d83-8c59-738de95a985d/how_to_reset_password_on_dlink_wireless_router_dir-615.pdf
    • https://s3.amazonaws.com/wibedubosateg/zegesogajizibepovifa.pdf
    • https://s3.amazonaws.com/wixamupelinere/8051_assembly_language_programming_tutorial.pdf
    • http://kikukuvikato.myartsonline.com/wanimifawixuvunefi.pdf
    • https://s3.amazonaws.com/ropidadegaxut/bunoxotuporiwozovidil.pdf
    • https://uploads.strikinglycdn.com/files/084af813-382b-4aa2-ad26-7bf1b3f1b1e8/endurance_shackletons_incredible_voyage_by_alfred_lansing.pdf
    • https://uploads.strikinglycdn.com/files/4829773f-fbc3-45cf-9220-58897be7878c/how_to_clean_a_microwave_convection_oven.pdf
    • https://uploads.strikinglycdn.com/files/ca5ca5cd-aa90-459a-91cf-d64c5ed8d816/to_build_a_fire_quiz_answer_key_commonlit.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_off0000e007.bin
ed9565d4e40a26176fc3db1753956448a88d08b4e23c998b5f165634038150b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 5504 bytes
font_01_sfnt_off0000f2c5.bin
8e9b1cc254088ae3c7bf972bd917dbc6352566a0ea7a48e5ad632dc4fd524192		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 11444 bytes

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