Malicious PDF — malware analysis report

Static analysis result for SHA-256 e937e82c475442ad…

MALICIOUS

PDF

76.2 KB Created: 2021-04-05 12:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75a7845844c70a6249d2ecd1879fa829 SHA-1: 70a86961dbde283891071360f442af4ff3cce8a1 SHA-256: e937e82c475442ad759ad102a9d71bde92020fa758175c09775201dcfac65d08
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, suggesting an attempt to manipulate search engine rankings or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=fce+test+3+paper+4+listening+answers
    • http://weridif.medianewsonline.com/98893257646.pdf
    • https://cdn-cms.f-static.net/uploads/4366364/normal_60534fdeca539.pdf
    • http://sunufosabupes.scienceontheweb.net/32538307956.pdf
    • https://static.s123-cdn-static.com/uploads/4482189/normal_5fdf80ac3edd7.pdf
    • https://cdn-cms.f-static.net/uploads/4448991/normal_605c8bba1e1e2.pdf
    • http://tejasatobes.medianewsonline.com/21954221965.pdf
    • http://fetazobamu.iblogger.org/how_to_reset_jaybird_x2_headphones.pdf
    • http://zexawof.22web.org/49908094742.pdf
    • https://static.s123-cdn-static.com/uploads/4390323/normal_5fc759cfd285e.pdf
    • https://cdn-cms.f-static.net/uploads/4447878/normal_6011d5b622149.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b6058ddc-808a-4809-8340-f8c70813c2e8/2736657421.pdf
    • https://uploads.strikinglycdn.com/files/5b5ab251-679d-49f6-ac37-76c909ce37ee/xubigivamapilegez.pdf
    • https://uploads.strikinglycdn.com/files/897b131a-cd40-48a3-81d3-7a051880bd61/line_6_spider_v_20_presets.pdf
    • http://ludumidajite.rf.gd/new_moon_july_2020_time.pdf
    • https://uploads.strikinglycdn.com/files/0b8c3b30-8a17-4981-abd9-ad0d300bb025/pusemod.pdf
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_449f6dd245244a349e9a9a1848398a9a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/565a8933-6330-4ba0-a5c6-95529903d6b4/how_to_make_papa_johns_thin_crust.pdf
    • https://uploads.strikinglycdn.com/files/3db4c9ce-88ee-47bc-bf8a-64b484c7d34e/generac_7550_exl_price.pdf
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_e57806dc805d41c0a69f0d087040ef1b.pdf?index=true
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_10f6feb271cb47da8e8e0ed3fd6e0bdf.pdf?index=true
    • http://wubunulawu.rf.gd/reading_comprehension_worksheets_grade_11.pdf
    • http://nilezowavegat.rf.gd/togazodemeguwone.pdf
    • https://uploads.strikinglycdn.com/files/bf27497b-e324-475e-af12-197e239f3785/38166171286.pdf
    • https://uploads.strikinglycdn.com/files/1d258806-9b3b-427d-b76f-e6a470db2a26/1609310715.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee8b.bin
5250bdc3c5b8a68b3303077901e80e628915d77534def050adfa7bb16e3543ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 5400 bytes
font_01_sfnt_off00010114.bin
2e5cb635e3a277d4c96977fab7263af01212f1b230995324fe34e562287fd45a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 10072 bytes

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