Malicious PDF — malware analysis report

Static analysis result for SHA-256 650f39508bcbd352…

MALICIOUS

PDF

79.6 KB Created: 2021-03-18 02:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6c99473e708626462d1ed1603d7dc3f8 SHA-1: 6f82618114888cf8e0bbd999d46aeccc6ae46f6f SHA-256: 650f39508bcbd352fecab6283231bac078ce57e58b1d1b2779ab1d811093cf91
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a 'strik' path suggesting a malicious redirect. The document body, though heavily obfuscated, contains text related to 'achieve goals for students', likely a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=how+to+achieve+goals+for+students PDF link annotation
    • http://maddot.space/72641945641ovfkt.pdfIn PDF document text
    • http://zahlungsservice-ch.site/govivekusasunebusakiv66z8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_601ab8a25ae45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450350/normal_601bfc4a384cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495839/normal_604b33b8c3de8.pdfIn PDF document text
    • http://bazis-rostov.com/we_the_kings_sad_song_roblox_idzgil0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vosivoru.epizy.com/zatiwajubiresumilalan.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_f19db63ff8c742b984b99f0d39a9e15e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/709803d7-1462-4366-af8e-2d0e885cb138/descargar_traductor_espaol_portugues_gratis.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_0040d6948b6144548cb61e1489a087ae.pdf?index=trueIn PDF document text
    • http://makeromevoju.rf.gd/24019012973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752020e0-60e1-443c-aa3c-295815e05697/how_to_add_multiple_answers_in_google_forms.pdfIn PDF document text
    • https://3d1db4d0-c196-4dd3-8d5c-bb108cafbd43.filesusr.com/ugd/479e38_3e0cfada9e2b4e559a591465e14c6403.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b10256-5810-4ada-9f3e-f31104cb40db/75985837285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa183c5-32b1-43b7-b1c9-6f191fe91b99/programmable_logic_controllers_frank_d._petruzella_download.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/jumujofewobaxirutowopolas.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_f68990f9e5d949ab8789c258d7f83168.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/63345537007.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/wunder_von_bern_tor.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_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 5396 bytes
SHA-256: 05839360c99e1cf9cc5ccb9f7422bfe71cafcddc1e9fdc35f059b025a75ce02b
font_01_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 11060 bytes
SHA-256: 671aa1aca6f40d1036966ec405626e260c8e56b5235c3dbe115d428b8af1b4b7

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