Malicious PDF — malware analysis report

Static analysis result for SHA-256 328831007e94fb1e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-02 20:14:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3d193f965c69630a31f4e454e7a07583 SHA-1: 817f24323037e2abe162f20b1a55b3361bfbbaf8 SHA-256: 328831007e94fb1ee97f02b279080c6880473f9c13d17b6e6335aa29825d7651
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains numerous embedded links. The primary attack pattern involves redirecting users to malicious websites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, appears to contain search-related text, suggesting a lure to disguise the malicious links. No scripts were extracted, but the presence of multiple malicious redirector links is a strong indicator of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=are+2011+chevy+traverse+good+cars In PDF document text
    • http://tugrull.com/problemas_de_la_educacin_en_mxico246io.pdfIn PDF document text
    • https://robaralimojo.weebly.com/uploads/1/3/0/8/130814718/33c10c0c5df81c.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/61f7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_60173283307b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408172/normal_5fcb6388ce9f9.pdfIn PDF document text
    • https://pobivizitonep.weebly.com/uploads/1/3/2/8/132815986/4696089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_60344e1c4b95d.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/5789062.pdfIn PDF document text
    • http://savadaqwe.space/are_there_human_universalseb81p.pdfIn PDF document text
    • http://filemarker.store/apple_pencil_pressure_sensitivity_not_working_procreatekck4p.pdfIn PDF document text
    • http://cmb-societe.com/australian_monster_truck_racing_associationcbkh0.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/pidetidiropalekulinun.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/how_to_answer_why_amazon_interview_question.pdfIn PDF document text
    • http://barberking.best/goririziliwenaxexuxys3qs.pdfIn PDF document text
    • http://webmastervlad.ru/55880633153soboe.pdfIn PDF document text
    • https://vofitusu.weebly.com/uploads/1/3/5/3/135301199/namudix-dugix.pdfIn PDF document text
    • http://shopmzm.site/movistar_mexico_telefono_fijoeu8cb.pdfIn PDF document text
    • http://ersoil.fun/comentario_matthew_henry_completodi0t3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391340/normal_6009f529689ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapirexazi.onlinewebshop.net/change_is_gonna_come_lyrics_olly_murs.pdfIn PDF document text
    • http://durozebexonadop.rf.gd/35806678477.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_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 5648 bytes
SHA-256: 7625363692d5acb159441a535c8b8c3a6dab3e108494c0939d21586ee917f479
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 11164 bytes
SHA-256: 370833a9c34c69a12dae374811f94210fa9ce8a4aa3e129248977dc791b385f1

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