Malicious PDF — malware analysis report

Static analysis result for SHA-256 c809580caf4f64f3…

MALICIOUS

PDF

73.2 KB Created: 2021-05-30 05:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6988e94fcd12a3b9b7b0a7226c7942c2 SHA-1: d0a0889e297daf35710e0335dd0542cd47aadc3f SHA-256: c809580caf4f64f3bc456598cbb1f43434184a9de2f5ad020314f3f9a68551a6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with heuristics indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=oblivion+ost+m83 PDF link annotation
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/9321398.pdfIn PDF document text
    • https://nawawuxilebop.weebly.com/uploads/1/3/4/6/134679594/kegekuxipuxigopa.pdfIn PDF document text
    • https://jesokalatozu.weebly.com/uploads/1/3/4/5/134591365/lateros.pdfIn PDF document text
    • https://kinimozudex.weebly.com/uploads/1/3/4/4/134498073/2bebb3f67369.pdfIn PDF document text
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/2d265.pdfIn PDF document text
    • https://fipufiradak.weebly.com/uploads/1/3/0/8/130813779/2dfc17004.pdfIn PDF document text
    • https://lulakoxefinadi.weebly.com/uploads/1/3/4/3/134332070/2249603.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449602/normal_5fff6adc56796.pdfIn PDF document text
    • https://xibupofuku.weebly.com/uploads/1/3/5/3/135306475/dorubum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481055/normal_5febbfb081acf.pdfIn PDF document text
    • https://notesorujul.weebly.com/uploads/1/3/1/4/131407176/538499.pdfIn PDF document text
    • https://diwapaxifok.weebly.com/uploads/1/3/4/4/134488462/e9fdecd0.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/219e5b62-61b3-40f8-93c7-de556c2f31fd/how_to_date_a_browngirl_summary_shmoop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21982a84-92d5-4575-9884-08738d250edf/fepipomiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629acac3-3ea9-4954-a767-b4227773fbb8/what_are_the_occupational_therapy_models_of_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ab49dc-7da7-4005-a347-80b77bb7cf41/how_to_activate_your_p_ebt_card_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00276dbd-8bee-4722-a3c5-21d1438ab39f/57716810054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a97e36d-5486-4516-bf8f-c1925d426d1a/how_do_sound_absorbing_panels_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8014ab-6fdf-4309-8ae9-5188242df77c/verbos_que_terminan_en_f_en_ingles.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_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 5108 bytes
SHA-256: ceb5f6a3dccaa6d30fb80b0e1178047d6f24341653f556dc855498fbe6454959
font_01_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 11696 bytes
SHA-256: 1cc990d3525da43ca74171ec0622c049288aca78e7a4dd5ee004f8414be6a6bd

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