Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc83f18945647ad…

MALICIOUS

PDF

92.2 KB Created: 2021-03-16 00:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 66fc7955309c9146ec556df4f44c3960 SHA-1: d891768a92608c618dcb378b3c65bf0b4b1072b3 SHA-256: 4dc83f18945647ad22e2c32643df0501b3bf38d05994c3218f368ed44ed886ba
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The ML classifier and ClamAV heuristic strongly indicate maliciousness, likely related to phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious websites.

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://gimoguvi.ru/wix?keyword=gramatica+a+the+verb+estar+answers+page+76 PDF link annotation
    • https://bulewafaki.weebly.com/uploads/1/3/4/6/134682315/gobozakitagokez.pdfIn PDF document text
    • http://shopee24.site/874809220716oj56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450730/normal_5fcfae8038ea5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477655/normal_5ffe58327f320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419630/normal_6037c34c12755.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/EhdjfRR/14084563594.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/gB6EBat/spring_coffin_nails_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/befulirawid/bhhieie/all_cartoon_network_games_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_600a920201b9a.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/7182834.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/Nljeb8X/wood_block_puzzle_game_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fivodewile/hieiajb/ragdoll_engine_push_fling_script_pastebin.pdfIn PDF document text
    • http://geniusenglish.space/kusabatuxinadjk64j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_60472a37cfb34.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/fiwuwi.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/sozokijonutuw_xetajuk_pozatow_punupuxuvezuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b1ce46-cf4e-400e-b906-e18cea153e3e/statistics_probability_distribution_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c83aaac-8ac6-4edb-8eb8-49e0a43e7a20/32738088875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec0085d2-3724-4b31-b43e-7e7c54a32f6e/42627535538.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12515 5872 bytes
SHA-256: 299599968675011e29997f8466f2a651ccef3dda6ad88c5c0047f01cab82f776
font_01_sfnt_off0001390e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390E 13108 bytes
SHA-256: 422fee280ee370e075f8ede89b607a14431310a7a53465518872177f863d0ba1

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