Malicious PDF — malware analysis report

Static analysis result for SHA-256 8548eaf29e6e3635…

MALICIOUS

PDF

79.1 KB Created: 2021-02-24 03:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8e3e177ba3cdd5e9f146a7cfc4f1bb82 SHA-1: 179baa1fb8ba7dd95810639fcec89dd2092aa664 SHA-256: 8548eaf29e6e3635d22018fb9c651af6e3dbd216a0919ce754dbb64aab987104
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious intent through a large number of links. While no scripts were explicitly extracted, the PDF structure and URL distribution strongly suggest it's designed to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/123?utm_term=how+to+see+notes+during+powerpoint+presentation+2007 PDF link annotation
    • http://waniwukudalutef.22web.org/sherlock_holmes_case_book_solve-it-yourself_mysteries.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/bhhSmjd/47886872476.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/bakonusibuno.pdfIn PDF document text
    • http://thesimplycompleteseries.com/zadimapefegonomurusavwjjpu.pdfIn PDF document text
    • http://gratoraama.space/wopekexalu3nlss.pdfIn PDF document text
    • http://fruittea.space/riwatujizubqxcq4.pdfIn PDF document text
    • https://rakamirun.weebly.com/uploads/1/3/4/9/134904708/pireterejep.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/fgieANf/menagefubozibegap.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/ddV2haW/sikamala.pdfIn PDF document text
    • https://kukegogefip.weebly.com/uploads/1/3/2/6/132681459/fbd5adcee8ba3.pdfIn PDF document text
    • https://zafudibibini.weebly.com/uploads/1/3/4/1/134108698/nowudav.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/gjcjcgc/quotes_on_freedom_of_speech_and_press.pdfIn PDF document text
    • http://chestlune.online/62456552900boim5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sevuvev.epizy.com/best_background_images_for_website_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/wow_classic_undead_warrior_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/capture_one_12_guide.pdfIn PDF document text
    • http://filanovedo.rf.gd/vitifipovuzazebidakojidi.pdfIn PDF document text
    • http://fikakoba.rf.gd/corel_painter_2018_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/chocolate_tamil_movie_songs_free_tamilwire.pdfIn PDF document text
    • http://rapuzivawa.epizy.com/function_buchholz_relay_power_transformer.pdfIn PDF document text
    • http://tulixiwubov.epizy.com/life_of_frederick_douglass_quotes.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_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 5504 bytes
SHA-256: a3fb8f9e26ad522a39b18ca219140990e01193ea77b2633ed20afbf5a7d218e1
font_01_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 10112 bytes
SHA-256: f386b217804ee5c5d653de756dcb836482742b6bbebfad5673a9f5307582d536

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