Malicious PDF — malware analysis report

Static analysis result for SHA-256 a471a9e74627b4b6…

MALICIOUS

PDF

182.1 KB Created: 2021-03-18 23:15:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5951bd3d9869801324122f2e1b2177c2 SHA-1: ef8dfcc4f584d043230437eb7809df01ca42e156 SHA-256: a471a9e74627b4b6762237c2936368826821e68e2b4bfd554910f77ea6e2fcfc
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 an external URI pointing to a suspicious domain, likely used to host a phishing page or distribute further malware. The document body, though heavily obfuscated, suggests a lure related to a study guide, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://midufefew.ru/wix?keyword=ephesians+study+guide PDF link annotation
    • https://dilazewinu.weebly.com/uploads/1/3/0/9/130969594/2455143.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/204e9d6c72736de.pdfIn PDF document text
    • https://putusura.weebly.com/uploads/1/3/1/6/131606782/gupatakonikavuxon.pdfIn PDF document text
    • https://zixijatujomalul.weebly.com/uploads/1/3/5/9/135962278/7637865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_602f5e8f37649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_6022d03611307.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/vufalitigu.pdfIn PDF document text
    • https://kesevure.weebly.com/uploads/1/3/4/4/134497963/2c334581.pdfIn PDF document text
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/javemexavugagaz.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/78cfc175aee.pdfIn PDF document text
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/8276863.pdfIn PDF document text
    • https://vopupina.weebly.com/uploads/1/3/1/0/131070761/rejoda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447101/normal_600340ce34995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_6052da130128f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465133/normal_6043064003c73.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/0493a516-8211-4481-9ab3-7771bc81c09f/gefolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d976700-d32e-424c-b21a-0ffd1ccf87d6/the_kargil_girl_full_movie_watch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/tuvevigi.pdfIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_a7c9f9e9a0fd47adaa78a5e0037bce95.pdf?index=trueIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_288f7235890244b5b4c8d08d5788c65e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f430df94-53e0-450c-962e-32eb9bcd8642/59509397337.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_c37b6be8eca149c5a71436f28fc59dd9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubefula/child_body_outline_drawing_free.pdfIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_10b5058d951c47cea5d58ed6fc9279f5.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_0d781e17f9724651a7fddd115e72da0e.pdf?index=trueIn 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_off000292c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x292C8 5152 bytes
SHA-256: 803c1aacd597244e5514437fa730f1d868c0c8dcfb4f91431fbf0b91cc40dae7
font_01_sfnt_off0002a45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A45B 10892 bytes
SHA-256: 1bcb8529f80da20f7e5c418a93645bf742c4b93a5c30ea3bed397be0ff6842b2

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