Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb23fd4f772be3b…

MALICIOUS

PDF

77.0 KB Created: 2021-03-28 06:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 00237a4279a0558b0c3da787b0f2c386 SHA-1: c13f59b9295d8509c604bb6752ffe40c42167ba1 SHA-256: 6bb23fd4f772be3b8fddb923c0abf14438d166d4fc359b28c1153b819e5ee938
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing infrastructure. The presence of 'utm_term' parameters in some URLs further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=tango+the+art+history+of+love+pdf PDF link annotation
    • http://kinemulawaw.sportsontheweb.net/funetowixujovas.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/clhgoji/rugesawat.pdfIn PDF document text
    • http://kolaxowivod.22web.org/como_evaluar_a_mi_lider.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/gghfa4b/fokef.pdfIn PDF document text
    • http://biditudoti.22web.org/53925919288.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/bhjhjgh/segen_solar_zimbabwe.pdfIn PDF document text
    • http://nufudotaruja.iblogger.org/66034563221.pdfIn PDF document text
    • http://vivabozuna.iblogger.org/hindustani_bhau_video.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mujesogi/project_closeout_powerpoint_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/important_topics_in_anatomy_for_neet_pg.pdfIn PDF document text
    • http://wawuzir.epizy.com/80766332003.pdfIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/trasplante_de_medula_osea_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4f2f23-980c-49bf-9788-a42bb2298495/navy_neckerchief_square_knot.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_3d5f3cc3ef5c4872bdf25f474f7ae087.pdf?index=trueIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_c55cb7b6b35b4c57b09db6b6c1eebbfb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d1514c2-77b4-4e07-86bc-209093be33de/telefowafitiriguzalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81aab58f-5214-49aa-93e7-9cbd2a159401/how_to_reset_change_filter_on_sundance_spa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0e0796-d6d1-49e4-9367-9d58fdf3c9c1/how_to_reset_viper_auto_start.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/toefl_reading_practice_test_with_answers_2020.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_7a2b4305fd9f4d47a73cc5d4b324821d.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_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 5412 bytes
SHA-256: 1ab1f19181a7e02df00b1fa276f6db751a7dda31b80e34d1b1aea80637bd46eb
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 10224 bytes
SHA-256: 32928b1de2f8ba1a7676aecfabff485f9c3ef1d8f88afb89c3718e0654fa3d43

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