Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e670a8b45070bd…

MALICIOUS

PDF

82.4 KB Created: 2021-04-24 23:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f6a1a135e532288dc6fddad184021555 SHA-1: 7629c5d63698b4b4c8b7399f040eaae416c43dd2 SHA-256: 50e670a8b45070bd8f53e6eb51d7953736b8f0563205edd311fd3aa642a92fc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://maypoin.ru/strik?utm_term=what+is+the+best+electric+toothbrush+for+whitening+teeth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416810/normal_6026da217e69a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_6045209eb43f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5fdaeac554520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_601906fd0f64d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379626/normal_5fcf11e29b938.pdfIn PDF document text
    • http://lamanixumerad.mypressonline.com/edema_physiology.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/3031271848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_603a8bf9697ea.pdfIn PDF document text
    • http://valigulepi.scienceontheweb.net/87585491470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448548/normal_5fd6a61db7dde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369904/normal_5feb7a8b500cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vazisi/cribbage_rules_runs_with_ace.pdfIn PDF document text
    • http://ditanumugagoma.myartsonline.com/que_es_anomia_social.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/paredixasuvarunoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/508aa4b5-c6c3-44e2-b594-266a95391f5d/the_5th_wave_book_3.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/knowledge_graph_question_answering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d12684-7b70-4b4d-a88c-a6dd589819e1/does_hcn_have_hydrogen_bonding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a183e466-49ae-4ec8-bb45-d6f1dc740ccd/43270124316.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_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 5388 bytes
SHA-256: 22551bd770d6a25fb25253e92ef41adbd0c19f691c14d01a6210c0dc62593955
font_01_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 10856 bytes
SHA-256: 7780c86a822d70116e3f17dd13d1fa25a886a65069351cfb96950e522362acda