Malicious PDF — malware analysis report

Static analysis result for SHA-256 146d6eed0e5c5ef7…

MALICIOUS

PDF

77.5 KB Created: 2021-05-16 00:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dee4c43d110eb131f83c0a67c49ff817 SHA-1: 206dcd1d73878880d227a5e80dcbcdd1b1ed073f SHA-256: 146d6eed0e5c5ef7c58d103849e913527c68bbc072a6003becbeac7ef3f904f1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://bologen.ru/strik?utm_term=cuisinart+ice-70+electronic+ice+cream+maker+review', is suspicious and likely leads to a malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, possibly involving the exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://bologen.ru/strik?utm_term=cuisinart+ice-70+electronic+ice+cream+maker+review PDF link annotation
    • http://wurulef.22web.org/sewaxetufisoxinesaraxi.pdfIn PDF document text
    • http://zanapipok.getenjoyment.net/moxuberivikef.pdfIn PDF document text
    • http://golixudib.mypressonline.com/grade_7_mathematics_practice_test.pdfIn PDF document text
    • http://obschee.xyz/saluxovomopevabpzvu8.pdfIn PDF document text
    • http://beach-fruit.fun/running_rich_vs_lean_2_strokee8kg2.pdfIn PDF document text
    • http://moditem.22web.org/agenesia_cuerpo_calloso.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/63310538260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/different_types_of_text_structures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c49f03f-9904-4fc5-8940-16afa9ce8b0b/dapugi.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_32e1b27f952f476c80ed05fd29c1720b.pdf?index=trueIn PDF document text
    • http://biborufa.epizy.com/37023089153.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/how_to_reset_a_maytag_ice_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/nejazegixasupefulutofelu.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_4bd47efca95f4bba9cb2a43dfe191a4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ba053f5-7aec-43bf-aa61-8c14f2b9e1b1/wenizabonetekuruma.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/annual_return_under_gst_in_excel_format.pdfIn PDF document text
    • http://kutoduno.rf.gd/chrome_os_for_windows_7_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379a3cca-a796-441b-968a-0be783fcd6e9/john_deere_310se_backhoe_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00ee86e9-f1d9-4fe9-8727-b10ea82aab2f/honda_civic_2006_ex_coupe_oil_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/cp_plus_camera_mobile_app.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/vamaviguserubejezurapowu.pdfIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_f55627ca716545abb4c9505dee0aad3c.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 5320 bytes
SHA-256: a6b09e829edbd32b9e8ae8ec0484db5a68d3660f26ab4ea8ed6c82662072fecf
font_01_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 10660 bytes
SHA-256: 5584e5bac494818dba81ddcab944960c74317df5de47bc9e6b8c3b1b452c7c17

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