Malicious PDF — malware analysis report

Static analysis result for SHA-256 f448bc52343b3842…

MALICIOUS

PDF

69.8 KB Created: 2021-03-10 10:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 11e290cd0c9f82ae15018aa9dbbe2d38 SHA-1: 9fea356e45e4da91fff8ea1452561b5e449da93c SHA-256: f448bc52343b3842025c07397d2ec87a2066439990f93bf3dd27605ab877d21a
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to direct the user to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and numerous links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://bologen.ru/wix?keyword=frascati+manual+wiki PDF link annotation
    • http://rasipafus.getenjoyment.net/immunization_schedule_table_2020.pdfIn PDF document text
    • http://mikuwaguvif.22web.org/classifying_chemical_reactions_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_602c0093ccc11.pdfIn PDF document text
    • http://viwumurowiwoba.22web.org/sc5020_deployment_guide.pdfIn PDF document text
    • https://zozelezike.weebly.com/uploads/1/3/4/4/134434207/fuvajozavamub_jadagidubefufo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384483/normal_5fdeed88df29c.pdfIn PDF document text
    • http://disozire.mygamesonline.org/64895956958.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/nakuwenemewitowezofuv.pdfIn PDF document text
    • https://cdn.sqhk.co/rosafipex/hgcMkjb/shark_ion_robot_r85_troubleshooting.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/36073620988.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/bonow.pdfIn PDF document text
    • https://kavasudominid.weebly.com/uploads/1/3/0/8/130813783/jisomuxirezutalopu.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/if9hhcZ/79401591953.pdfIn PDF document text
    • https://cdn.sqhk.co/powitaxixu/d6jegjW/personal_biodata_format.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/9c60900f-e7cc-4628-9750-18829f85f037/how_long_does_a_dyson_v6_animal_battery_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da221d07-2742-45d5-adf7-8abc43796109/how_to_read_like_a_writer.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_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 5056 bytes
SHA-256: a102d1e58c24bdc3c6806bf9cdf8af3de780d5efe43bdc8dcb5322563add1f27
font_01_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 10064 bytes
SHA-256: b67c34ea3230a356f13923fcc398238144f769f1d3be0934390394c93a1b3fe0

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