Malicious PDF — malware analysis report

Static analysis result for SHA-256 271bd8134857806c…

MALICIOUS

PDF

76.5 KB Created: 2021-03-14 09:16:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1f6e64e670cfe878fe49ff6c013f3b1f SHA-1: fa9780ea0c6b65ef186ba8b64015f3be812d2023 SHA-256: 271bd8134857806cee1c93eab469db8dcc0753ee2056e7e44e64d82358d5bbf3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'maypoin.ru', suggesting it's part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is designed to host many links on disposable domains. No scripts were extracted from this sample, but the presence of embedded URLs and the overall detection profile strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/award?keyword=document+to+pdf+converter+software+online PDF link annotation
    • https://cdn.sqhk.co/jipodipotaj/fge7Ghd/chikki_bar_hs_code.pdfIn PDF document text
    • http://pelubexeto.getenjoyment.net/strategic_management_concepts_and_cases_competitiveness_and_globalization_12th_edition_free.pdfIn PDF document text
    • https://cdn.sqhk.co/mudebijutene/bjfx1d4/japebevo.pdfIn PDF document text
    • https://cdn.sqhk.co/jinavefajevo/igidLhb/meme_generator_free_app.pdfIn PDF document text
    • http://toworugesolur.getenjoyment.net/best_cfop_algorithms.pdfIn PDF document text
    • http://pejagepelif.iblogger.org/ketosteril_drug_information.pdfIn PDF document text
    • http://paxulujomem.iblogger.org/montblanc_meisterstuck_le_petit_prince_solitaire_doue_classique_fountain_pen.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/statistical_analysis_of_survey_data.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rowavironipomiz.epizy.com/3d_studio_max_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e75e1af-3834-4dc5-aa9a-064b5cfb3e84/where_does_the_rainbow_start_and_end.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc9a117-afe2-4244-b4f1-e4692abd6942/how_hard_is_the_clep_english_composition_test.pdfIn PDF document text
    • http://tikuvusupatel.rf.gd/wibitul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7b0bfa-f7d6-40f0-9741-4156af33986e/sozujudixejitatenipij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce71f77-2e06-4b5d-8987-b2a079a245db/how_to_make_whole_rainbow_trout.pdfIn PDF document text
    • http://mutifitiwexo.epizy.com/moto_g6_play_specs_verizon.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/death_note_misas_song_english_lyrics.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_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 5452 bytes
SHA-256: a1bd98079756fa532ad779549df9a134b661a75b6879fb0e0d868584bb6e24ec
font_01_sfnt_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 10012 bytes
SHA-256: e021096d1c0e9abf20b41f760351a61f7796b02a227cbdbadaac706ecc55d712

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