Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5210974dd259c4…

MALICIOUS

PDF

75.0 KB Created: 2021-04-23 17:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 52465a87c1b352196d6c2f264f2f1fe7 SHA-1: 9cfda9193e55b1044a7d50ea6a69217473ecc8ce SHA-256: dd5210974dd259c4fc790fcea4d68491b26c7e04a79862cbc9ffb668b195ab31
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, with a notable one pointing to 'xajibur.ru', suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=how+to+find+turbine+efficiency PDF link annotation
    • https://cdn.sqhk.co/ranotigu/crH8Tge/sonnys_menu_belle_vernon.pdfIn PDF document text
    • http://saveyoutubebot.com/respironics_evergo_portable_oxygen_concentratorndd68.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/wkpViep/zuzijobiten.pdfIn PDF document text
    • http://totalcreditreport.info/native_american_zodiac_wolf_meaning3sir9.pdfIn PDF document text
    • http://xilavinem.medianewsonline.com/energia_de_biomassa_vantagens_e_desvantagens.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/fgcjfgi/kokenorigokevixozubexi.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/wipoboweminigurawutulunir4iiv.pdfIn PDF document text
    • http://barberking.best/read_naturally_2._5_storiesn14i9.pdfIn PDF document text
    • http://wonder-ita.fun/wuzazanunazasejadjanit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://subogerilazelo.atwebpages.com/97224997169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e958930-a50b-4a2b-90e2-95b96d33d242/information_security_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c20931-f703-429a-b8f7-ee49686a0da9/marvel_comics_movies_in_order_of_release.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d08396-3c51-497e-bbdb-bd8e6fceafbf/5_constant_relationships_confucianism.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/pasoworonakove.pdfIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_04828b3ebb794b4eaf9bdf27536330fc.pdf?index=trueIn PDF document text
    • http://ketabigumowun.atwebpages.com/marantec_m55_myq.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_c1e7ebb4de84425d973cacbf39a3e183.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_off0000e902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 4888 bytes
SHA-256: de8b3fe1af3f5d714234b61b9b8c5e022965d68e710397d48b5d28e1a8d579ba
font_01_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 10992 bytes
SHA-256: 830b59d5bca673c39c5339c8a67059ae08b961fefe868990ba16caa12cd19e7c

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