Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b92aa87f5bd1d88…

MALICIOUS

PDF

85.8 KB Created: 2021-04-06 13:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0e4b8aa368ec2cd0a7f5a0888e34861e SHA-1: 2fdeddf5e9d0ae92cc8068f33507c1a292c500e3 SHA-256: 0b92aa87f5bd1d8830c238b36f2e38b62cdc6d949c69516cc4f15fadd42a5b8f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=building+academic+reading+skills+book+1+pdf PDF link annotation
    • http://donutota.iblogger.org/nusopaweverefaganokadufe.pdfIn PDF document text
    • https://cdn.sqhk.co/rixosadiv/k7hdzij/police_scanner_chicago_twitter.pdfIn PDF document text
    • http://mujojodisi.22web.org/91089987746.pdfIn PDF document text
    • http://afracheat7.xyz/how_do_i_defer_my_medicare_part_bm8oh3.pdfIn PDF document text
    • http://mebets.xyz/teri_meherbaniyan_mp3_song_free_downloadf50n6.pdfIn PDF document text
    • http://dreabling.online/95599755262cs4bw.pdfIn PDF document text
    • http://glossywp.online/xonodugejsa34x.pdfIn PDF document text
    • https://bozaveruri.weebly.com/uploads/1/3/1/4/131483492/3059da.pdfIn PDF document text
    • https://telewebejuta.weebly.com/uploads/1/3/1/6/131607630/domimijazabaju.pdfIn PDF document text
    • http://visiblawty.com/bachianinha_partituranndj8.pdfIn PDF document text
    • https://cdn.sqhk.co/darojopul/gqkMeIh/81322008466.pdfIn PDF document text
    • https://cdn.sqhk.co/gifidupuzuv/owdnNqU/76630650451.pdfIn PDF document text
    • https://melesosinipedo.weebly.com/uploads/1/3/4/4/134475371/7354a58281f4.pdfIn PDF document text
    • https://nuxaluvuwij.weebly.com/uploads/1/3/5/9/135997537/fevafom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapetevik.epizy.com/lks_barisan_dan_deret_aritmatika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48baa106-990a-4795-97c9-7643a5cae667/xixewukusosakuwe.pdfIn PDF document text
    • http://fexotupakel.rf.gd/candidiasis_vulvovaginitis_en_el_embarazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b85b3fd-c3f0-4b23-b2ac-bf7bdce805e2/logitech_-_m325c_wireless_optical_mouse_-_teal_zigzag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff3789e-b7aa-4377-a380-d54ddaa6dc0d/how_much_is_cfa_level_1_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3044d703-e733-4e27-9d6a-9e798a89f70a/bissell_vacuum_stopped_spinning.pdfIn PDF document text
    • http://forarit.epizy.com/filezilla_free_for_ubuntu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aee27ba-04bf-4b97-a22f-356ff216e9b8/20893558674.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_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 5780 bytes
SHA-256: a847f2a0c419e26bcaa26203f3fde0b620a0770fe226d9640e7a9cbc58f84546
font_01_sfnt_off000122df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DF 11452 bytes
SHA-256: 40e0f4d9edbe1fca0bfc4fb56c17763d1090e2dfcb176f55d43e19a3525b8f17

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