Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7cb25de3d7a8b8…

MALICIOUS

PDF

78.1 KB Created: 2021-04-28 23:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d0082a1009924f4dfab3da609a690b15 SHA-1: fe74e9ea202d0feee68e81df9c576bc40350ffb9 SHA-256: ad7cb25de3d7a8b829fdff95f29ce9b403b18ec3ac9cfd53c8eed1798b55f43d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=why+does+my+bluetooth+soundbar+keep+cutting+out PDF link annotation
    • http://fisukebisogovi.22web.org/pexefivegikulim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471692/normal_602f41bfc2fe0.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotonolo/InKjjPb/26568036873.pdfIn PDF document text
    • http://doctora.club/bexeronukadosabesd6pa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405903/normal_5fff5071415fa.pdfIn PDF document text
    • http://trynon.xyz/kefujaxusisiodflp.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/5hbzhjE/pogub.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxubefe/dZjiijd/fire_boy_water_girl_light_temple_primary_games.pdfIn PDF document text
    • http://studytogether.fun/chesapeake_shores_episode_guide_wiki1y4my.pdfIn PDF document text
    • http://mailedflkf.site/limowinijewapimuwepenaarln.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_60149fd5b368e.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/fhcmhMv/soxelorifuretezabase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_6061de4499126.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
    • https://uploads.strikinglycdn.com/files/2429d602-f949-4cd6-8654-1e5c441bf57f/intermediate_algebra_and_functions_worksheets.pdfIn PDF document text
    • http://wisunomimat.epizy.com/toni_nadal_is_he_married.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ca2fb1-f2ac-44b1-8254-341c00970dd1/93158424543.pdfIn PDF document text
    • http://vavukewapufusa.epizy.com/formation_animaux_en_suisse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f0d9c0-4d7c-481f-8a68-7e738e3a81e9/wendys_medium_fries_nutrition_information.pdfIn PDF document text
    • http://pamerugug.epizy.com/87883039117.pdfIn PDF document text
    • http://nemusif.rf.gd/60503721278.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_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 5688 bytes
SHA-256: c956604571636104c125de12658d6f220901fe20ca8afb1c2543ab38b447c256
font_01_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 10692 bytes
SHA-256: 4478249004578dcde9b8148a71c300f70f39ea0f218bc6857325bbcacaa7decc
font_02_sfnt_off00011cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD6 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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