Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8262e58dbbe96a4…

MALICIOUS

PDF

77.6 KB Created: 2021-04-06 04:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b1f64e2acb1d0c1d0f6074ac42792e51 SHA-1: 71066b7ca3b055033e3e6f7559c6ad2cfd880047 SHA-256: e8262e58dbbe96a4210a760523bb51bd6df9af7137fcd870a7eebef7297e4776
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://pelibifir.ru/wix?keyword=where+the+red+fern+grows+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450630/normal_606233862e14e.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/what_are_the_best_exercise_for_strengthening_your_biceps_bigger.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/61548695266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_606aee8fc350a.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/nextbook_ares_8a_stuck_on_loading_screen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_af861f31a9a3478981f2f51cf11f5611.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad31a725-b98d-465a-bae3-2b5af47fb4d6/93746883052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98226a6d-4855-4ff1-818c-4e481f6bd9a1/electrolux_central_vacuum_repair_locations.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/bomiwugekir.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_2a5274e5a3694fe9a68febb1b1a7dc21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8159dd2c-ed6a-405c-81ef-c3ce07346c75/4094548175.pdfIn PDF document text
    • http://ratazudawi.epizy.com/dyson_dc23_turbine_head_vacuum_cleaner.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_60d69079d894441d8d853f9a1be64c48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b5ae931-d373-4d38-9be2-8fddc297f3ed/online_arbitrage_sourcing_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26028551-f20d-456c-bd05-744d4b20a30b/fitzpatrick_advanced_calculus_2nd_edition.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/cognitive_behavioral_therapy_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a037663-3754-4487-aa32-6ff9a94c6373/jakobesawezafidaligijabe.pdfIn PDF document text
    • http://rosikelakijanup.rf.gd/15877276045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9423c388-00a5-47bb-bcad-43f4cf81c8f3/95580710620.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 5244 bytes
SHA-256: b759f4b390107b6432504b6439d1224df654bc3f5300d4d0b0c1538ab25b81af
font_01_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 10952 bytes
SHA-256: 430505222505161f4ef0883fcf1bff8796f1a3a70345b58e48ff281b0c882f68

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