Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8e9c7c2ef129a9…

MALICIOUS

PDF

114.2 KB Created: 2021-03-07 23:27:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5fdfad6e038bb317c0609f6d92d421c1 SHA-1: 99e94fdf77b1b2de3d20edb1d00201fc91fc63d1 SHA-256: 4f8e9c7c2ef129a900bba146b4f3a63401cb113d8f462ddec66699b4e8524ca6
186 Risk Score

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 0.9993

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=what+norse+gods+does+kratos+kill PDF link annotation
    • https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/2278019.pdfIn PDF document text
    • https://rewizefugubopu.weebly.com/uploads/1/3/4/2/134266162/kumenuxagonatota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447497/normal_603087265ed8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388046/normal_5fcf306c5816e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_5fda50179a002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_600c19509d419.pdfIn PDF document text
    • https://dojepojejexun.weebly.com/uploads/1/3/4/6/134668276/8605693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_603f7cbec46d8.pdfIn PDF document text
    • https://berebexamoleti.weebly.com/uploads/1/3/1/3/131384136/jimox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_26e6a4640c83460c8a5e375484f37019.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/healthcare_management_system_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/pukotetodoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b768bb84-9b46-4915-b044-4715c41a173f/18113551053.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_8d5c503b93144d9bb7f761a3671f27d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4fa697-b733-40ba-92e9-561fe9251518/dillon_650_performance_upgrade_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/67208797903.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/diary_of_wimpy_kid_deep_end.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/xerajife.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_faf17593d9a34711b787f819aa9ec228.pdf?index=trueIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_091eee3571b847e08f32a5aee53f03c1.pdf?index=trueIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_4292f8eb10344e0ab96dde98add34174.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_7321aeeb646443c883828e434082685a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43eaefa5-2f72-4f03-ba59-dbb4bc15ebd9/best_fenix_6_apps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963ede5d-decb-4314-b1a5-c0d54062263f/cuisinart_tob-260n1_chefs_convection_toaster_oven_stainless_steel_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264f9b38-ddfb-4f77-be94-8ac95b5e0e43/how_to_setup_my_harmony_remote.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_off00018069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18069 5164 bytes
SHA-256: bb74cacaa0fd8be6c61fa4b46bdb362ffa038cab7cb9e790e5bf0112b59391ad
font_01_sfnt_off000191ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191FF 12224 bytes
SHA-256: f8aa97c9abdf4ac60b83d3bc0a4f25297bbbbca8fd5264867af56119983ec828