Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca7dc37894e66e9…

MALICIOUS

PDF

80.3 KB Created: 2021-03-01 21:22:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 133e20d6bd65d15b5b8543301d73e79c SHA-1: ec9c055f14aa23820d17a964b3628b11d983cecb SHA-256: 6ca7dc37894e66e9d40756bec2fc3c0f5f65739b97763a7a441308cd8abc4e72
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external URIs pointing to various domains, many of which are hosted on disposable or dynamic DNS services. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of external links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

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://botokaw.ru/123?utm_term=edexcel+igcse+chemistry+workbook+answers PDF link annotation
    • https://cdn.sqhk.co/kobewudojuvo/iidjfkc/perfect_shift_mod_apk.pdfIn PDF document text
    • https://nipukidifa.weebly.com/uploads/1/3/0/8/130873732/peluwiveselopatuke.pdfIn PDF document text
    • https://cdn.sqhk.co/repejuvovod/nggicgf/9_months_game_cheats_android.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/73640157777.pdfIn PDF document text
    • https://zenanewexakidop.weebly.com/uploads/1/3/5/3/135310893/2144015.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/46734532110.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/vRTja6v/animal_skins_for_sale_johannesburg.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/j0zIOij/project_management_jobs_houston.pdfIn PDF document text
    • http://takudogifox.22web.org/background_green_hd_images.pdfIn PDF document text
    • http://pebimubegema.22web.org/brother_mfc-j825dw_driver_windows_7_download.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/find_the_centroid_of_the_shaded_area_shown_in_the_figure.pdfIn PDF document text
    • http://presalon.xyz/81889719684e6iic.pdfIn PDF document text
    • https://kilavolofijon.weebly.com/uploads/1/3/1/1/131164174/sopawedove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kagapoxarizi.rf.gd/how_do_you_use_a_walgreens_digital_thermometer.pdfIn PDF document text
    • http://porapasegunan.epizy.com/anna_maria_island_beach_fishing_report.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_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 5776 bytes
SHA-256: b9d97e2abf2ab6f092687893134e1f55079a02db0ac4ed1de140cfb6863dde8b
font_01_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 11048 bytes
SHA-256: 8c64e3a7d9e094e688ab374445c3d6f19350e86cc2b10c9736bc36108247a26b

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