Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adfb0ab54e7702b…

MALICIOUS

PDF

73.7 KB Created: 2021-04-06 17:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ca95906377e3d16f8d9dd1f6d57b766f SHA-1: 413f9d8e6f78b22c4af995b749239278ac44483b SHA-256: 4adfb0ab54e7702b7858f1b7afe4b401280e942542ce0b3b63ef0b17242697a7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, pointing to various PDF documents hosted on disposable domains and services like Weebly. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest a mechanism for redirecting users to potentially harmful content.

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://botokaw.ru/123?utm_term=fourth+grade+math+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/bilexodofose/j9Qig2K/html5_css_javascript_template.pdfIn PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/vafewaju.pdfIn PDF document text
    • https://derikuboxema.weebly.com/uploads/1/3/0/7/130776504/lizuguxix-bebuv-liwok-gegujopuw.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/wuvapakoraximaxazu.pdfIn PDF document text
    • http://koolmaxt.online/kakazumknn1u.pdfIn PDF document text
    • https://bitusuverutito.weebly.com/uploads/1/3/1/8/131871453/81fef56f1.pdfIn PDF document text
    • https://kegalanomer.weebly.com/uploads/1/3/1/8/131856310/wosebadub.pdfIn PDF document text
    • http://luzupogakij.sportsontheweb.net/boterebefigirifuxevonu.pdfIn PDF document text
    • http://lg-supportteam.com/43540378324ru07q.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/20470750b911e0.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/asdf_lkjh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_602806c266f13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6046a222033f9.pdfIn PDF document text
    • http://pifadopagel.scienceontheweb.net/88904742852.pdfIn PDF document text
    • http://pribor-poverka.site/computer_systems_randal_bryantjc0r9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_5fe8c44bb9f88.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/jXgdhcF/picot_antacid_wiki.pdfIn PDF document text
    • https://tepojaja.weebly.com/uploads/1/3/5/9/135966759/1fd4b4705cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xepuzakudera.atwebpages.com/african_culture_and_religion.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_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 5532 bytes
SHA-256: 01dc626af9fcdd8a4ca4f9a9c6ad5ce0684214049676883f5b0fa18052317072
font_01_sfnt_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 10720 bytes
SHA-256: 2de8de93ad9704f655c3828682fae01d646952b63c2cf97d11b42c4b6db40f41