Malicious PDF — malware analysis report

Static analysis result for SHA-256 2861102bde5e47f4…

MALICIOUS

PDF

78.9 KB Created: 2021-05-30 19:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bb169d27090c6caf5f9858e7a77c349c SHA-1: 9c3a836fbb607e0097c9956e08b302c8e0225739 SHA-256: 2861102bde5e47f4545d393c0c16ba2a89b9e43eeae02647a962591f381b9634
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm or SEO spam campaign. The primary external URL, https://baarspo.ru/strik, is likely used to redirect users to malicious content or phishing pages.

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://baarspo.ru/strik?utm_term=examples+of+formal+and+informal+email+writing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450337/normal_605d36ae89e9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_601e05d6bb72f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fc8639a59726.pdfIn PDF document text
    • https://ramitafot.weebly.com/uploads/1/3/4/3/134340854/84d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446761/normal_602b98dad78e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463279/normal_6066116811082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463005/normal_5fd0ddd202a1e.pdfIn PDF document text
    • https://xuminewas.weebly.com/uploads/1/3/7/5/137500686/c3a246380e.pdfIn PDF document text
    • https://saxukenewu.weebly.com/uploads/1/3/4/6/134649668/majesapudomaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_601ed6d24ce77.pdfIn PDF document text
    • https://kunejadisitezan.weebly.com/uploads/1/3/4/0/134096254/niditojodosupe_kalozenusiwavu_derotudi.pdfIn PDF document text
    • https://bewuzitavunu.weebly.com/uploads/1/3/4/3/134349104/4315730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_6013c3b0515c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_602166d20c3f2.pdfIn PDF document text
    • https://rarasaxemog.weebly.com/uploads/1/3/4/6/134611000/47649bd659.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/b40e247f-1b5e-43a0-94fb-c574c9415d2b/ms_excel_2010_all_formulas_with_examples_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ae3f65a-e62b-4d22-8207-bce9dcb0a4d6/how_much_does_an_sat_tutor_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4979c634-7106-4823-bc18-bab411329a4d/63117922763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81cc127f-91e2-47a5-b3e3-3125d4a37135/97066073305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58531abe-c9af-42e2-88f2-ae8547094aab/36312005771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e130087-d046-46cd-ab51-366c3a3bd0ed/total_war_rome_2_emperor_edition_trainer_2.4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a25d94-a504-4dda-90d5-51b9d30bd36d/97264245175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca007e1f-3b86-46c5-a201-b3b5e7c279cf/focusrite_scarlett_18i8_3rd_gen_usb_audio_interface.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_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 5476 bytes
SHA-256: d63a2267412358198eebafb48a1bdf507735518f0497f3ba97539c59809ff926
font_01_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 10532 bytes
SHA-256: 0c7b9151570842946119b6ddb8c3672990c83c7d24d24361349d9e6558432f73