Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39f88efc9845244…

MALICIOUS

PDF

74.0 KB Created: 2021-03-23 10:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33e1022d7f5feec2033195863e731bee SHA-1: 67abfa99a007cf27f6b52cc485f6f1768ffbf1be SHA-256: a39f88efc984524452200f241f8c6ed6cc1f8def6cc0f1e2209181ed7ad3d9e4
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are likely intended to create a link farm for SEO purposes. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=catcher+in+the+rye+guided+reading+questions
    • http://vazewuxu.mywebcommunity.org/bridging_heterogeneous_and_homogeneous_catalysis.pdf
    • https://cdn-cms.f-static.net/uploads/4369648/normal_603a2e2436707.pdf
    • http://tulavesew.getenjoyment.net/pressure_washer_pump_parts_craftsman.pdf
    • https://static.s123-cdn-static.com/uploads/4487381/normal_600605b96d412.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ruzakema.onlinewebshop.net/46592366477.pdf
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_52d5f871fc254b8fa3262fdb7ed8ea31.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bb23eb47-63b3-47ef-b626-d7a266c5d356/52939572535.pdf
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_6234f0d43148459aae49e62be7a6e22f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2afbe6a7-1bb4-4798-b408-ee243254c03c/oster_regency_kitchen_center_repair_manual.pdf
    • https://uploads.strikinglycdn.com/files/665b4025-3837-4b2f-b4fb-ce7cd4d19d01/how_to_reset_apollo_twin_x.pdf
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_a6902e7e36a54390989cb3b70217ba69.pdf?index=true
    • http://zodiripek.myartsonline.com/anhima_cornuta.pdf
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_946c22c78ca040c6995158eda8b98b9b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4f46ee2b-7be7-43c8-8b5a-0a34b0a23284/39375767596.pdf
    • https://uploads.strikinglycdn.com/files/e1a6fbb0-6c70-4e1a-8f9c-979ab23b617b/how_to_setup_hp_officejet_pro_8600_plus_wireless.pdf
    • https://uploads.strikinglycdn.com/files/39c2d22b-a3fb-4d61-bf0c-f9ea8c3a9353/why_is_my_hvlp_spray_gun_spitting.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_off0000e297.bin
1fc59fc571db92c7aeae97f4f1025ef08d0f1fd187c0c24b1b7214268998c4c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 5304 bytes
font_01_sfnt_off0000f494.bin
6b28333859cd5ca3506899cedec422a4fc7e959f5ea6ae5858cb864125f998de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 10748 bytes

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