Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15622757a84a41b…

MALICIOUS

PDF

80.9 KB Created: 2021-03-12 17:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1794deca7fd207c54c7e3b3ca18b443d SHA-1: b3e6e113b7611817a92727290bfc56c4cc6b75a5 SHA-256: c15622757a84a41b585fd4fb9998b4984127b4043d0a0f3f89b64861a855bbc8
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 hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/123?utm_term=automotive+grade+linux+vs+android+auto PDF link annotation
    • https://fadunununi.weebly.com/uploads/1/3/4/7/134747036/xozavoj.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/rekobaxu.pdfIn PDF document text
    • http://xunetokawetik.sportsontheweb.net/44810365071.pdfIn PDF document text
    • https://tuxipowu.weebly.com/uploads/1/3/4/6/134699968/f31fb07.pdfIn PDF document text
    • https://nosodelutota.weebly.com/uploads/1/3/1/8/131857544/puxaturizalodu_tevufugaxeniko_welologef_xuxojoji.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/1916625251.pdfIn PDF document text
    • https://wemavejuza.weebly.com/uploads/1/3/4/6/134689468/2135440.pdfIn PDF document text
    • https://bikawinudom.weebly.com/uploads/1/3/4/5/134595305/nomolop.pdfIn PDF document text
    • https://nililekekikare.weebly.com/uploads/1/3/0/7/130739967/5f825198fe5b26d.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/difference_between_binomial_cdf_and.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_fa79e9188e914c4db76c8d215fd3271b.pdf?index=trueIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_580dcd00989a42c09b2bd82781d9b257.pdf?index=trueIn PDF document text
    • http://kepawomokatuke.myartsonline.com/how_to_prepare_for_physics_exam_class_11.pdfIn PDF document text
    • http://timavutiziv.epizy.com/free_color_sheets_unicorns.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_262b0b24a05648d3b44fdabf8ac6c9c9.pdf?index=trueIn PDF document text
    • http://xaxuvep.epizy.com/andromeda_strain_2008_watch_online.pdfIn PDF document text
    • http://fararisujis.myartsonline.com/curtain_wall_glazing_details.pdfIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_205dfadac1eb415fa293464b5f660b2b.pdf?index=trueIn PDF document text
    • http://tososite.onlinewebshop.net/mokegoful.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_c3015cab73464c44b8c18b1b5e00557c.pdf?index=trueIn PDF document text
    • http://bexovivuvere.myartsonline.com/69128041020.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_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 5260 bytes
SHA-256: 1cdbf79363c7043b2bd87501a28408c4abae180033d2ae6f0f218ca48cefa4b0
font_01_sfnt_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 10592 bytes
SHA-256: a81a67c2f06f04ab719bef772b443191e15b028b93bcca07acf9c84697308256