Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29580a817b7de36…

MALICIOUS

PDF

77.4 KB Created: 2021-05-29 14:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ddc67105c52f89639c649a567a48ab17 SHA-1: 11ff9ac931c1d76872068f8f217730d7dab45db4 SHA-256: a29580a817b7de3675977b847cbb3bb790541b140e67826c1ffdbb2f10312688
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 0.9990

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://druttle.ru/strik?utm_term=will+gypsy+moths+kill+my+trees PDF link annotation
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/zuganoxufodip.pdfIn PDF document text
    • https://robiwadanojiso.weebly.com/uploads/1/3/4/6/134644007/nasafu_gasomotipenub_fukolut_panadivaxubi.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/645df25d45.pdfIn PDF document text
    • https://mofagobebaz.weebly.com/uploads/1/3/4/6/134633285/1497914.pdfIn PDF document text
    • https://jifujutikawe.weebly.com/uploads/1/3/5/3/135328504/bikoxetabised.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455174/normal_603bcab43d758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_605f546217532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_605b5742022dd.pdfIn PDF document text
    • https://tesokumerapaj.weebly.com/uploads/1/3/4/5/134522001/padep_jogofiwibebive.pdfIn PDF document text
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/lovile.pdfIn PDF document text
    • https://purelukanixavaj.weebly.com/uploads/1/3/1/4/131454065/232f42bd65365.pdfIn PDF document text
    • https://koredude.weebly.com/uploads/1/3/1/4/131406285/f9a7bdfc8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_5fd87bb295ef1.pdfIn PDF document text
    • https://wezawelo.weebly.com/uploads/1/3/0/8/130813956/zadedanus.pdfIn PDF document text
    • https://niduzipotobumam.weebly.com/uploads/1/3/6/0/136054567/xuxibonesegolo-zodot-wupora-sowafarajogizez.pdfIn PDF document text
    • https://fevolasoboz.weebly.com/uploads/1/3/7/5/137514380/6981285.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c979a3-f651-4345-83a2-e5ec23f3ffc9/gubajapafajubugis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5ea297-8f49-4aa9-b2dd-1988671bb3f9/best_self_tanner_for_fair_sensitive_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac7bd1c-bce6-4c24-ab26-86e7acbbea15/english_file_intermediate_third_edition_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3efefa3c-e22c-48cc-b914-53ed41c1236a/brain_rules_john_medina_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8073ac83-94d3-4d5f-a118-5aa1f1e5701f/c_language_video_tutorial_in_hindi_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b68ff84a-d326-4a4f-b52b-84b9e5c7d693/80845289767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6871e088-8ab7-4bfc-85b2-13dd6da77990/bovesulafajug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ccb13f-c1d6-433f-b9b9-01d2b9f2ee59/annual_report_cover_page_design_templates_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58ab4f4-9748-412b-b242-cafa479513ec/jotipokirip.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_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 5200 bytes
SHA-256: db710c01380878c401d2e1395ce9a68c1665965390a78f90611ca1c16382c4a6
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 10356 bytes
SHA-256: 6fa929cf23331d82392d882729c782f618ca491ab61c79bbd15200cee586cfd2