Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e924bfe26c6007…

MALICIOUS

PDF

76.5 KB Created: 2021-03-05 00:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bc955b296a2331d87f9236555f6d14f2 SHA-1: 148ff02fb5a203e806fd231ab630d13f64668289 SHA-256: 11e924bfe26c6007b431cd973424c91cdb8c3706970d55e31057c97c9ee8c956
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially malicious sites. The ML classifier also strongly indicates maliciousness.

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/wix?keyword=copper+chloride+and+aluminum+mixture+or+pure+substance PDF link annotation
    • http://manovina.mypressonline.com/ms_sql_server_2012_support_lifecycle.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/hFRyIzu/hospital_pics_download.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/how_to_bend_pipe_offsets.pdfIn PDF document text
    • https://rugalasaludazi.weebly.com/uploads/1/3/4/6/134683923/jikotolimip-rodumuwosa-potoben.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/67820027854.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/kazodupegaz.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/niazjbW/31126162660.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/vafaliwizewalunulovu.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/6a514f338f76c.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/89491799117.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/what_is_franks_gift_in_the_son_of_neptune.pdfIn PDF document text
    • https://cdn.sqhk.co/takabalal/jebdsFn/best_heroes_to_use_in_idle_heroes.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/how_long_for_capped_brood_to_hatch.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/44277008362.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/harmony_350_remote_setup.pdfIn PDF document text
    • https://kolenogu.weebly.com/uploads/1/3/1/8/131871799/7562429.pdfIn PDF document text
    • https://pitinolulisam.weebly.com/uploads/1/3/1/3/131381612/farekiguwosegos-kefuxa-tonukabuj.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/466724db-9d03-43ac-8bc9-887aad9c0667/kosopima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691be2ad-9168-4f73-85db-3a0248df8c85/artigo_261_do_regulamento_do_imposto_de_renda__rir_99.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af355cb-dc73-4612-9b1b-1a4da00abf02/samsung_galaxy_s5_mini_mobile_hotspot.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_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 5428 bytes
SHA-256: 1b07a8fb45ac807f56f03d62bd3a9a38bd2cb42a6611e4d91627d8cc1ec0a30c
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 10224 bytes
SHA-256: eed7d92622f40aa7fc501d7b0c729c27316934d379b3a35731060d1068c2b813

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