Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d94c7e20df627b…

MALICIOUS

PDF

190.4 KB Created: 2021-03-06 21:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4bf6e91870d65ad34984d33633d5df0b SHA-1: 50a05260b8e1d82be8f8b624355c509df3fa4aea SHA-256: e6d94c7e20df627b14c7db988620dd9aec3197a946dffc21ffb6e7d536f62869
134 Risk Score

Malware Insights

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

The file is a PDF containing multiple embedded URLs, many of which point to disposable hosting services and are associated with link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of URLs like 'resalured.ru/wix?keyword=recompile+apk+apktool' suggests a lure related to software development tools, likely to trick users into downloading further malware or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/wix?keyword=recompile+apk+apktool PDF link annotation
    • https://pulufakifene.weebly.com/uploads/1/3/3/9/133999255/7234051.pdfIn PDF document text
    • https://cdn.sqhk.co/gowexenopa/gfQjbjf/geometry_dash_fernanfloo_3_jugar.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/hh7aO2I/overkill_s_the_walking_dead_steamdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369775/normal_6003b26dd19ef.pdfIn PDF document text
    • https://sarefipa.weebly.com/uploads/1/3/1/3/131398419/tajeginokezezuwazap.pdfIn PDF document text
    • https://zelopira.weebly.com/uploads/1/3/5/9/135990333/fbdedd34720e.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/ghbbicN/last_cloudia_ssr_ark_tier_list.pdfIn PDF document text
    • https://ranutejojem.weebly.com/uploads/1/3/5/3/135314135/jelapo.pdfIn PDF document text
    • https://cdn.sqhk.co/pagupuxu/POjctgi/tajilinas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463006/normal_603d3e2be25c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448551/normal_5ff78e46462aa.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://uploads.strikinglycdn.com/files/e0158ec2-48e3-4f4a-8e38-830c84583519/chefs_choice_1520_electric_knife_sharpener_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee9e31e-4696-476e-8ab5-9e1eb1a2581c/lowrance_elite_4_chirp_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f396e93-0305-4adc-a841-77d2d7e73c53/pisixenotiwim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49391a7-9563-4beb-b5b5-da01a455f1c0/gijewerojedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb64dd7-326c-46d1-9062-c4a2b7e17adc/how_to_clean_top_loader_washing_machine_with_baking_soda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9355c347-ac1f-470a-8911-437449162ac2/plantronics_voyager_5200_uc_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b63fb42-17b1-4ab7-ba0c-4878841becf8/giwufosifevuxajijal.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_off00029a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29A0A 4556 bytes
SHA-256: 0d2919bf2e299df3b4e5d1bab97b870fbda92f7e4ee5a3c1f124ae6cf054ece7
font_01_sfnt_off0002a985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A985 16792 bytes
SHA-256: f4de254ed4a7e05739e963d8b742bdc9b0aa5bcbca36083f8a395c23b4a34362
font_02_sfnt_off0002dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD78 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361