Malicious PDF — malware analysis report

Static analysis result for SHA-256 91455077a0931c27…

MALICIOUS

PDF

67.9 KB Created: 2021-03-16 16:00:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3aeb1543a37c377d65d06bd7042b898a SHA-1: 9a2b914a791c1be08a976f48b899084dd8e16142 SHA-256: 91455077a0931c27672784f81c82564367587067db920fb715520570c682ef04
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary focus on `https://lozipotod.ru/award?keyword=fundamentos+de+investigaci%25C3%25B3n+en+psicolog%25C3%25ADa+uned+pdf`, suggesting a phishing or malware distribution lure. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` further supports this, indicating the PDF is part of a link farm hosted on disposable domains, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://lozipotod.ru/award?keyword=fundamentos+de+investigaci%25C3%25B3n+en+psicolog%25C3%25ADa+uned+pdf PDF link annotation
    • http://vugekowuzujed.scienceontheweb.net/29389903433.pdfIn PDF document text
    • http://bijatutolime.iblogger.org/59160864893.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416140/normal_5febb65306cd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_6021b9c9c151f.pdfIn PDF document text
    • https://vepibasizux.weebly.com/uploads/1/3/1/3/131380915/nonujijutoxusegow.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/how_to_wear_a_face_mask_properly_with_glasses.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5fc691c29b83b.pdfIn PDF document text
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/09a3d10e8dade.pdfIn PDF document text
    • https://dujefeva.weebly.com/uploads/1/3/4/5/134589135/e8ca59a70a1f6e0.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/how_to_work_my_vizio_sound_bar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467298/normal_60017ee93ebb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paropabaru/anemia_falciforme_en_el_embarazo.pdfIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/sanimakatek.pdfIn PDF document text
    • http://liwusetokabozil.epizy.com/67787689519.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/vobukufapowizakavilusuw.pdfIn PDF document text
    • http://jajijewanetu.epizy.com/83342909627.pdfIn PDF document text
    • http://joriboka.epizy.com/budget_bytes_sheet_pan_fajitas.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/filter_excel_data_into_multiple_sheets.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/14211099024.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_off0000c735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 5584 bytes
SHA-256: 356cf403d162cbe6007396d49e28ffd2086225be4e1a3b4c73f6524b546dbcb7
font_01_sfnt_off0000d9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 11508 bytes
SHA-256: e3ddb7d75229abf6dcdf8e03f3ae2fe9dd0667cddbd237679a19456e4f393d78

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