Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20be24861a0a7b7…

MALICIOUS

PDF

74.7 KB Created: 2021-04-04 15:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2da99d345b26c4f080db07286363f9de SHA-1: 20e304d0f1062bdc80bcd1294ce974d2c4f5a236 SHA-256: f20be24861a0a7b7f31033cac26a5197ab68f94d73e9f07f53f0b1b39ce0b9f4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains a title related to connecting a keyboard, likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/strik?utm_term=how+to+connect+moko+keyboard PDF link annotation
    • http://xuxijosut.sportsontheweb.net/45104968640.pdfIn PDF document text
    • https://cdn.sqhk.co/ropikenetu/n7gjhcG/5737684454.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403410/normal_5fe5df76d31b9.pdfIn PDF document text
    • http://lopitimew.mygamesonline.org/kewegukujelomoporaxarin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422135/normal_5fe4e234b9d8c.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/hbjMUsZ/grid_autosport_mod_apk_latest_version.pdfIn PDF document text
    • http://zopesozali.mypressonline.com/70636262271.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/sql_injection_tutorial_for_beginners_step_by_step.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/maytag_washer_code_e01_f09.pdfIn PDF document text
    • http://davorivugexawu.sportsontheweb.net/73591036684.pdfIn PDF document text
    • https://cdn.sqhk.co/xorakulenido/wRNhbie/barcelona_transport_map.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389097/normal_600519770e264.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451210/normal_5fcf1534e7a59.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/propiedades_del_cascaron_de_huevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415530/normal_602c30b0683e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nukilaba.myartsonline.com/rilobawiwebifezokugupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f921dfb2-343c-406d-b141-f632e04f60e1/fesuramevo.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/stay_with_me_easy_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1999b3c-5718-4a5d-a8ba-373bfc38682c/ditaxowokubixasefenalajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa17ee7-ea1e-4b02-93b0-1b05cea5de0b/where_did_aboriginal_art_start_from.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5779e39f-1c59-45c8-8739-63353b813510/67952733572.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/zimisagavosomi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 4976 bytes
SHA-256: 81eede2f8bb9567e41e57a8271065224d100ffd1c17435878913d4497546474b
font_01_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 10276 bytes
SHA-256: 0b302569cc1a687f5a4d50e64e12e36d8096c88a468bab26d19fa9f2dab1a43f
font_02_sfnt_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378