Malicious PDF — malware analysis report

Static analysis result for SHA-256 f923f408c62fae90…

MALICIOUS

PDF

93.3 KB Created: 2021-03-15 21:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f88d95e5d6f5577dfe5e7c13421968de SHA-1: 2f38ef8384761f83100c38132888a5828d024b92 SHA-256: f923f408c62fae90dfedcec78c2efff5b521a81851db0ce842b60cb6023679bf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://resalured.ru/strik?utm_term=star+trek+enterprise+season+4+episode+16+cast', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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://resalured.ru/strik?utm_term=star+trek+enterprise+season+4+episode+16+cast
    • http://birjand.design/chopin_sheet_music_preludeb12c0.pdf
    • http://bestunew.xyz/dugupoadtfl.pdf
    • http://mynasert.online/domitugk416y.pdf
    • https://cdn.sqhk.co/nizekidido/ieifZhc/wikigibigabarives.pdf
    • https://cdn.sqhk.co/befozaxulot/jdpvGgf/38388499768.pdf
    • http://losinglotterynumbers.com/exterior_angle_property_of_a_triangle_worksheet4b8ww.pdf
    • http://giwitijudaleka.mygamesonline.org/bhagwat_geeta_in_hindi_chapter_11.pdf
    • https://cdn.sqhk.co/madumubo/dheDZjg/giligemusegasozil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_63b4a82df01f457db34c2f123c51b00c.pdf?index=true
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_119e1610b149444387e69212ebbc2e4a.pdf?index=true
    • https://f766a7e9-a0d0-4e3a-bf7c-946d2e8c2ff4.filesusr.com/ugd/bddb96_2cf0a7899f844c6e939df00bcb59dfa8.pdf?index=true
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_f8b7abd842ba469aa3d036b868030415.pdf?index=true
    • https://uploads.strikinglycdn.com/files/49b567df-1de7-4bd9-88bd-e4abc8acb192/49844622724.pdf
    • http://xifeloj.onlinewebshop.net/zapimimafepekilizopug.pdf
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_4471ef86aa394aa5b979a385874c146d.pdf?index=true
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_24822548dfc84ebaba2b11c07386fc5e.pdf?index=true
    • http://wutejaxevewef.myartsonline.com/dekaperon.pdf
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_93d7607406b54611a9cd9d27b6f805f5.pdf?index=true
    • http://fuxuxasezid.atwebpages.com/algebra_2_statistics_worksheets.pdf
    • http://kavuduvolilazod.myartsonline.com/wowuxoverazotoxiwomoli.pdf
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_157c7fe87bc24b56ab3564657a50e99f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1429b9dc-f64d-4a62-8b18-d74c6037e5e3/series_of_unfortunate_events_episode_1_summary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001229f.bin
bf303ec022a161dff4d4a1af991c7397b150698133c94d75518e8f583222e56f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 5284 bytes
font_01_sfnt_off000134a2.bin
9ccf22ec96e371e2a0574fbe1fbfae757359a2cdc3bb53f61e19e081124b8ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134A2 10848 bytes
font_02_sfnt_off0001598e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1598E 4324 bytes

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