Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca987589a53150b…

MALICIOUS

PDF

82.4 KB Created: 2021-05-04 00:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9093136ed434407aa62660e9641b98ed SHA-1: c0f240fa5fa5547ff3b3bf73b15b7e365410fd4f SHA-256: 0ca987589a53150b571e2c991acd500ad4305818a24264113f33a6f54f871b08
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 0.9992

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://soxebez.ru/strik?utm_term=is+the+brother+mfc+7360n+wireless PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488592/normal_604ad814bbad2.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/fRSGcfG/4v4_team_deathmatch_fortnite.pdfIn PDF document text
    • http://ditulut.iblogger.org/54730340288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492250/normal_600f4cebd7448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414153/normal_6037edba650c7.pdfIn PDF document text
    • https://nadenekaf.weebly.com/uploads/1/3/0/7/130739264/keduduwobevejemul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373986/normal_5fee76a2bcc27.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/5haAxhi/94510188608.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/yJgiVaj/planets_in_retrograde_2020_june.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/4268501.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/eyi7ghG/59117136046.pdfIn PDF document text
    • https://cdn.sqhk.co/duzemata/jqihjep/27095867851.pdfIn PDF document text
    • https://pulogumofus.weebly.com/uploads/1/3/0/7/130739416/5077816.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/5915b.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/vanalogobanun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502436/normal_5feb1804a8d3d.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://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_9afb70daa99442088c9eb2d0cb28da2c.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_ac8dfbec1d3e4faa98bbe186561f9a87.pdf?index=trueIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_3bfb1c0d945d423da47fac603f6c7ae4.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_e1c83783a6bf4fc6a62a2c8011547463.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_bd791865b57c407b8cfae08a57b21244.pdf?index=trueIn PDF document text
    • https://1dda4824-043e-406b-9213-03d4b91bb4d1.filesusr.com/ugd/7695bb_9266eb8d20e846519c4ec22184a90736.pdf?index=trueIn PDF document text
    • http://takumoz.epizy.com/fofejumorokab.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_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 5408 bytes
SHA-256: 45f42bf8c00eeb5a63847462417ab7f1cfa335a2e836eab7d060a305bb2d506c
font_01_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 12444 bytes
SHA-256: 227f085adc315830a77677acc930bead5a24890271b88644d4d6b776998a4938
font_02_sfnt_off00012e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333