Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5e24e133b9b087…

MALICIOUS

PDF

81.8 KB Created: 2021-05-26 07:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 125b8349a638626335410fec4e32f751 SHA-1: 8c73e2d8c772ceba2bf375c002bbcfdc8a6d8e2a SHA-256: bd5e24e133b9b087bc1876faa26822b0ecc22cac0ad95f9ab567bd716a6af119
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=como+hablar+con+un+adolescente+que+no+quiere+estudiar PDF link annotation
    • https://gugekeki.weebly.com/uploads/1/3/4/3/134374678/javixurivupapepojafu.pdfIn PDF document text
    • https://zaxadumumuguxe.weebly.com/uploads/1/3/1/4/131454216/50a51edcc018de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6012df06da299.pdfIn PDF document text
    • https://fenemonefozu.weebly.com/uploads/1/3/0/7/130739495/kimoka_sidimetejujux_tuxinebag_gafamopat.pdfIn PDF document text
    • https://bakefakibozig.weebly.com/uploads/1/3/4/6/134678469/jujijapuli.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/2145558.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415742/normal_5ffa30d2cb896.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5ffa5c50c17e5.pdfIn PDF document text
    • https://kawijidaxo.weebly.com/uploads/1/3/4/8/134891868/kazutopemogakemupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_6059b83c4c862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_600d88a1acc3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_606d208d06601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_6069938e13d30.pdfIn PDF document text
    • https://rebavunegiluzu.weebly.com/uploads/1/3/4/4/134497465/setaboval-mijevobezev-jagobinexogada-winozezufako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_60402350ba7ca.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/jipeziwamefopat.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/3d15cd3f-06f8-43a2-88db-e418ce65c40b/can_you_paper_trade_on_thinkorswim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ef2be5-da7c-4756-90f4-b250ae0e295a/oracle_sql_decode_in_where_clause.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca00de6d-8a8e-41b6-827a-e98c5be55531/29822540312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71584028-7cc9-4483-9bce-43f366f8e878/815764368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea47f43-070a-47fc-b240-0bb4c50dad74/86132662307.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_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 5348 bytes
SHA-256: b676a13ffad60c1943c33088704b60e6392027586340f0b51d1cafbf991538ed
font_01_sfnt_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 11976 bytes
SHA-256: 0351012251cb9d1342de1b41c20a319a4064366c1ada987a8f5e8c91a0d00ae9