Malicious PDF — malware analysis report

Static analysis result for SHA-256 55eec7ba410cb856…

MALICIOUS

PDF

77.0 KB Created: 2021-03-20 11:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d5f4fc8e8d26676acd167f39135a9e5f SHA-1: 5a65105657889f1e305c65f24777b0e568ab7467 SHA-256: 55eec7ba410cb8565617a59259e8dd12f78278111302c25ed8d1ef953d0e3ffd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=prefix+and+suffix+worksheet+grade+2 PDF link annotation
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/faled.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/what_is_bi_directional_load_test.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/jojudogek_ratuxonuwijen.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/how_to_use_schumacher_battery_charger_se-82-6.pdfIn PDF document text
    • http://reduslim-eu.site/34949716127qn9l6.pdfIn PDF document text
    • https://tajizaruf.weebly.com/uploads/1/3/0/8/130813694/8278582.pdfIn PDF document text
    • https://votivugaxowo.weebly.com/uploads/1/3/1/1/131163932/xefafimevurepasare.pdfIn PDF document text
    • https://megelegekirir.weebly.com/uploads/1/3/4/4/134464092/gemebe-wuledatavewodov.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/building_construction_management.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/jDigjgG/game_army_toys_town_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xinosemu/hgfVrih/80_s_vintage_aesthetic_wallpaper_tumblr.pdfIn PDF document text
    • http://lerob.info/my_fire_alarm_keeps_beeping_every_minutegdyw4.pdfIn PDF document text
    • https://cdn.sqhk.co/tevenijubuso/m0v9igE/nuralojemadaxofakumis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pitugozuput.epizy.com/e_aadhar_card_correction_form.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/60802502465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6481342c-2d0c-4300-82bb-f0e5be8ae3cb/66457184439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/861416ee-bb6e-4a06-bebe-c6052fa54f19/jinokem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b0c325-8971-40d2-a054-82c046f6ac8c/52059789504.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_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 5492 bytes
SHA-256: fdf66290bc7617a684fad84e00f77359ee61a2c3e75fb577a47436d4e7242685
font_01_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 10816 bytes
SHA-256: 0f7545c9972cabbf091508c3ec092ee9d1cca36a05127fcb990042620bdfefaa

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