Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0745dd76eac2fc7…

MALICIOUS

PDF

76.8 KB Created: 2021-06-10 15:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a3641b75e4f2bdf8c8ba9f16c1721b43 SHA-1: 2ebc69a22be7ccfa905f800098e47f330b5ccb97 SHA-256: a0745dd76eac2fc769bcc6f806e79e7cfe104661b8f870b2ba5ff1ae498609ae
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 disposable hosting services, suggesting a link farm designed to distribute malicious content or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/pbw?utm_term=horngren%2527s+financial+accounting+8th+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479932/normal_600313142422b.pdfIn PDF document text
    • https://wevoforu.weebly.com/uploads/1/3/4/5/134591306/b0bcaf8642cba.pdfIn PDF document text
    • https://mifakukataw.weebly.com/uploads/1/3/5/3/135349500/4460e2c.pdfIn PDF document text
    • https://pumijisiror.weebly.com/uploads/1/3/1/3/131381241/gelepusobulizi.pdfIn PDF document text
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/91f3f8c77b70ed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_604761a15e00c.pdfIn PDF document text
    • https://fuwefojogimoro.weebly.com/uploads/1/3/4/3/134339806/nolowelaja-zukenegusided.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420470/normal_6055829d84a42.pdfIn PDF document text
    • https://lirisosu.weebly.com/uploads/1/3/1/3/131384099/4988865.pdfIn PDF document text
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/xuzesexobosoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_605fbed002671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487409/normal_606c61fd2bc2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463810/normal_5fe7917821052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_606989ad13853.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387243/normal_60b2547b21de1.pdfIn PDF document text
    • https://sutevanu.weebly.com/uploads/1/3/4/7/134770908/291592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5ff261e087eeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/145016016/best_farming_base_for_th11.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144422373/how_long_it_takes_for_tadpoles_to_turn_into_frogs.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144736956/how_do_i_update_my_arris_firmware.pdfIn PDF document text
    • http://zuxanoguk.pbworks.com/f/67355383471.pdfIn PDF document text
    • http://magogopowo.pbworks.com/f/zixabuxolatudezinususivep.pdfIn PDF document text
    • http://lezakoliz.pbworks.com/f/how_to_write_an_email_asking_for_information_from_client.pdfIn PDF document text
    • http://rezedul.pbworks.com/f/kesenawojudizixasajigaw.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_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 5608 bytes
SHA-256: 7c578f2f5ac98f28083d9f2b1c6a98f1b39d0d0abbc87e20059f9b37ebd9d2d2
font_01_sfnt_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 10792 bytes
SHA-256: 33c8abb21548b468b2a0672c5cd97c06c0f89c2d0545d25a8e15b4b3ae3d2ddc