Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a2a78d345bfc15…

MALICIOUS

PDF

87.7 KB Created: 2021-04-17 05:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 32ef64ee83083e36d4ebd3b537ce9b73 SHA-1: 8413410dfebe0c1c75a1e4c0f7563bad70521cb8 SHA-256: b6a2a78d345bfc154fee8edd9fc266be331f03c7b80264d1d394c95591ace89d
186 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=singular+and+plural+nouns+ppt+for+grade+1 PDF link annotation
    • https://cdn.sqhk.co/walamalesumi/YohdgfP/codigo_descuento_cabify_como_usar.pdfIn PDF document text
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/lomenovonu.pdfIn PDF document text
    • http://wssummer.space/xizebekopaxelabumatenuwufxder.pdfIn PDF document text
    • https://cdn.sqhk.co/jibanukagexa/ebDgcja/vojowobadefipikijot.pdfIn PDF document text
    • http://guzoseta.getenjoyment.net/xusaxudonudevubov.pdfIn PDF document text
    • http://konsalting.info/informacion_sobre_la_caverna_de_las_brujaseredj.pdfIn PDF document text
    • https://cdn.sqhk.co/jebixusugak/jhgjgfG/gubabezanemigas.pdfIn PDF document text
    • https://cdn.sqhk.co/purorenutuw/jeqiJHZ/69909873743.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/dghlied/the_crossings_premium_outlets_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/1fBMGJl/zeladix.pdfIn PDF document text
    • http://newsportstechnology.ru/twc_rc122_remote_manual913pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/pMbhhji/mawavuvuwomematale.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/5hfdZhb/gunimisunun.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/chdTibv/cute_puppy_wallpaper_for_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/rinezodoniga/jSH9Chh/pemoteja.pdfIn PDF document text
    • https://cdn.sqhk.co/jebavimot/iaugege/turbo_car_traffic_racing_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/memenewo/wlhfjji/mcat_practice_test_cost.pdfIn PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/1232080.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/rofabekasuvun.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/53672450178btz4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11651 5364 bytes
SHA-256: 3460a4c4b746b1568574a371817c459e00f6f0fb7e1b49ed5d5355e2c55831e6
font_01_sfnt_off000128a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A4 11476 bytes
SHA-256: 334f9f5f63166c1fa495a4ac5433fa09b354fef51bb10c15c607a840f9aebb3e

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