Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebbb71dfabe84ec…

MALICIOUS

PDF

76.5 KB Created: 2021-02-20 00:58:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e2a243d385e00845b45326115b25e580 SHA-1: 9c051ba61a8e94aee3b58e9a29dea5bb1402bcea SHA-256: 4ebbb71dfabe84ec44d2398f04cbfad639998962567aed64db1256cea6fe08a2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, including one to 'maypoin.ru', suggesting a phishing or ad-revenue generation scheme. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=marketing+data+science+modeling+techniques+in+predictive+analytics+pdf PDF link annotation
    • https://cdn.sqhk.co/gejupajo/ibNWXif/gexolanibevowebofa.pdfIn PDF document text
    • https://kivisibef.weebly.com/uploads/1/3/0/7/130775328/0341507c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_6017dedd3d1bc.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/814e129359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_602b79b8aaf84.pdfIn PDF document text
    • https://xoxopurotawasuj.weebly.com/uploads/1/3/4/6/134651309/f2f0ae52e8b6.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/3a1ghGc/city_building_games_xbox_360.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fe1d00b2c708.pdfIn PDF document text
    • https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/a66adefa42.pdfIn PDF document text
    • https://sufusaripowo.weebly.com/uploads/1/3/1/4/131437865/989971.pdfIn PDF document text
    • https://volenasidopawo.weebly.com/uploads/1/3/4/2/134265528/2773207.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/jqyiaGo/business_project_manager_resume_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_601bd236e2b94.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/hj65r17/air_france_flight_ticket_status.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tigewibejageju/78825390199.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/mutually_exclusive_probability_questions_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 5808 bytes
SHA-256: 593589aebab1d6b003f868abfdd07a40e9e951262237efd8f43f03317ae1bcd1
font_01_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 10632 bytes
SHA-256: 6bc015d1a06f9da76046392305856824c1e080c513be8035a27e4e5c04f1c700
font_02_sfnt_off000115bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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