Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd5e834e9946da2…

MALICIOUS

PDF

98.9 KB Created: 2021-03-29 20:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6954da0047360d3c9ccdde74c77d90e0 SHA-1: 34a4799048326388537e141fff727bee02b9605f SHA-256: ffd5e834e9946da2d42e01fc9790953d0d1857c043cc608c1e3f67855c38d7d4
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure itself is used to host and redirect to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/award?keyword=alarma+revista+pdf PDF link annotation
    • https://cdn.sqhk.co/tezofugowura/dhahdaj/dwyane_wade_stats_2014_finals.pdfIn PDF document text
    • http://rozel.ru/what_is_meant_by_separation_of_powers_definitionkx7hp.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/contabilidad_de_costos_un_enfoque_gerencial_14_edicion.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/C29hehf/the_bowl_naples.pdfIn PDF document text
    • https://cdn.sqhk.co/fosigigamef/XhaNKRT/bluestone_perennials_coupon_shipping.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/hihhxgc/the_communist_manifesto_summary_chapter_1.pdfIn PDF document text
    • https://cdn.sqhk.co/zotiperugi/cibjiDt/ok_ko_stickers.pdfIn PDF document text
    • http://kofojoxake.mygamesonline.org/oxford_translation_book.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/50489759503.pdfIn PDF document text
    • http://maxist.ru/dell_inspiron_15r_n5010_drivers_for_windows_10_64_bitrb10w.pdfIn PDF document text
    • http://talemine.getenjoyment.net/89451982237.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/jcC3Aje/daily_hourly_planner_free.pdfIn PDF document text
    • https://cdn.sqhk.co/guxifunuris/Ojijhgh/66007677318.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/f7f15ab5-fe53-41cc-99e0-83767ef8a141/learn_english_through_tamil_app_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c339b9a6-c589-43dd-b06e-e6ca1d234c85/jegojogopevifoze.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/poulan_pro_blower_bvm200vs_air_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0acbe58-0e34-41d1-84f7-073c385af1d5/how_to_pair_iworld_wireless_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25996ac-6215-4d6f-b9b4-d50bf4370b1a/48557167063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063cdbe3-1ec5-48dc-bc28-30601928a76d/dobubeviliwe.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/ansiedade_livro_em.pdfIn PDF document text
    • http://fadudenomo.onlinewebshop.net/algerieinfo_el_khabar.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_off0001433e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433E 5236 bytes
SHA-256: 68b621455d96ff58f5dd3afaf5487d26b29e870ede3b9944b1bbaededf14986d
font_01_sfnt_off00015500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15500 13248 bytes
SHA-256: 48ed56224a5fb2f37484e394ba04fc5d83e32a3bf50d13bb774e42948d83c0d9

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