Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2131c87542003e5…

MALICIOUS

PDF

84.0 KB Created: 2021-06-05 07:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6afd99209901903de22183bea055d355 SHA-1: 0b1ef22aa899234b05c3f23a91e7cf20b6db2e53 SHA-256: c2131c87542003e5c18bc76241b8291cab65f55d97dba5d9d7c3d2989b133396
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains with unknown or benign reputations, suggesting a link farm or SEO manipulation tactic. The presence of ClamAV detection and ML classification as malicious, along with the PDF_SEO_LINK_FARM heuristic, strongly indicates a malicious intent. While no scripts were extracted, the overall structure and link distribution point towards a phishing or malicious redirection scheme.

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://xajibur.ru/123?utm_term=chevrolet+traverse+2018+user+manual PDF link annotation
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/b7f7681fb431d5.pdfIn PDF document text
    • https://fuwidomanajano.weebly.com/uploads/1/3/0/8/130874101/f4c5cab5b6e6b5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4381320/normal_60b4fbc441f69.pdfIn PDF document text
    • https://vadururufuwowo.weebly.com/uploads/1/3/4/5/134581676/6928050.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5fcdbc49a6fd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5fd762c5e44e5.pdfIn PDF document text
    • https://batabokisusixil.weebly.com/uploads/1/3/4/6/134689132/9486167626738e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_602b350bb7c57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pokuwatosat.pbworks.com/f/armitron_watch_manual_40_8417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1641b86-7c52-41f3-b597-a71c6cce78cc/pilagulaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1800ef9-50d5-4998-ad7c-8d58240f6d3a/red_book_us_coins_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003f4912-4f1c-4107-928b-325f544b87c0/syncrowave_250_arc_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4710c14-7dd1-4947-8d81-2a73537de077/how_music_became_free_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a13d89-b360-4e1b-aab5-e09f797c6024/how_big_of_a_download_is_star_citizen.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144427704/building_maintenance_service_agreement_template.pdfIn PDF document text
    • http://zixereves.pbworks.com/f/descargar_crash_bandicoot_2_para_android_apk.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/waec_further_maths_past_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4cf3780-cc2b-49e0-8b67-9d95e3e57b4a/how_often_should_i_change_transmission_fluid_honda_fit.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144420588/audi_a8_d3_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7affc69a-74c6-44ff-819a-371009ed3b25/20107426804.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/fujulokinegakizunon.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/f/xuwezavifedop.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/litawaboku.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_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 5412 bytes
SHA-256: 0aaef58d3b5c18faf0c0be01e9eac5b283d510b5eef3511c6ada315130eac9d3
font_01_sfnt_off00011b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 11472 bytes
SHA-256: 384514789cdcd7a120401f28455cf0598727cdf72fa86a1d6d0cb3454ff21619