Malicious PDF — malware analysis report

Static analysis result for SHA-256 08efde9252d35532…

MALICIOUS

PDF

80.7 KB Created: 2021-05-09 13:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 49673cd1cb9bd12679312d826790d4a2 SHA-1: 18bf78ce3de6b58827fbb08588d8fe2e55619ce3 SHA-256: 08efde9252d35532c426d21b5dc2dddda4f6081464a24166f513c68a182c7da2
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 0.9998

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/strik?utm_term=how+to+setup+skyrim+load+order PDF link annotation
    • https://kutusavirub.weebly.com/uploads/1/3/4/2/134265758/3e4533579b75627.pdfIn PDF document text
    • https://baxolelal.weebly.com/uploads/1/3/4/6/134625426/01c8d3cd9.pdfIn PDF document text
    • https://kovirelumen.weebly.com/uploads/1/3/0/8/130873776/jowuxepo_sulipufuwusut_sipukosasuri.pdfIn PDF document text
    • https://zexexoxanevekig.weebly.com/uploads/1/3/4/6/134672397/5de2a130dad.pdfIn PDF document text
    • http://a1metromovers.com/15893765213d7y3m.pdfIn PDF document text
    • http://bitjoms.xyz/5176942226686cag.pdfIn PDF document text
    • http://igcopyrightclient.com/kotor_walkthrough_korriban_tombsmb0v5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7e995c03-61a3-480b-ab9b-f7aa7cc6e748/4552522525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11bd62f-21b5-4733-b4dd-6dca60fe89ba/amazon_kindle_4_2011_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0730f45d-179b-4a64-86e1-44519eab5802/netgear_wn3500rp_user_manual.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_d8f1ccb6d7ae41789ac3bf1f4d066d56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1d84d03-65d6-4d30-918a-a21969c43af3/symbol_for_standard_deviation_on_ti_30x_iis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf28ba8-f3b2-4e8f-845a-46e62b7b09f7/fanuc_31i_lathe_programming_manual.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_87f4c208d8f54af09aea3b730cc98da9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a9ef367-d5de-4e59-bd7c-971b72b8067b/best_star_trek_enterprise_episodes_season_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656aa63a-dca0-4c3b-9577-aa5e634b6d52/lifumurelafed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f637d4-7a8b-40c9-a7f8-0b287e77d7b2/momaregegiwugodej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e531f9-0306-4d06-9de3-9f0886b6dc11/garmin_vivofit_jr_2_star_wars_dark_side.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 5100 bytes
SHA-256: b3fff1546beb842dd1b319ed59e7bc0eeab8dd7cf6002947727c9c6b5d9d8f96
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 10172 bytes
SHA-256: 9fef4de69d6a04441f6f99bcec2048aefe3d8d7234e535454f277f054045f4e0
font_02_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2