Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fefb8b0b6d1eee…

MALICIOUS

PDF

112.3 KB Created: 2021-03-20 09:25:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 465f2207706d6432335572f4025dccbd SHA-1: b0c3d415d6bd932f47d953020ba440c0486384be SHA-256: a2fefb8b0b6d1eeeb0343c8e2373e02b2b967831a7ade7116d99707a6e7304bd
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URLs, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the heuristic identifying it as a link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=apache+web+server+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404733/normal_5ff80465d6e59.pdfIn PDF document text
    • https://viweruvuwoloti.weebly.com/uploads/1/3/4/5/134577653/7281920.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/ravaverekexoluz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_601b1f8a67eeb.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/68882030444.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/jPcvaBZ/netacad_quiz_answers_chapter_4.pdfIn PDF document text
    • https://rasaputale.weebly.com/uploads/1/3/5/3/135323831/0088946b3.pdfIn PDF document text
    • http://freedate18.xyz/canada_s_best_mattress_platform_bed8awje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_60186788638e4.pdfIn PDF document text
    • http://vivubowi.getenjoyment.net/80359887292.pdfIn PDF document text
    • http://jawunefuda.mygamesonline.org/rerowukegemadowipep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389376/normal_5ffeb38bd6491.pdfIn PDF document text
    • http://mofobawosenej.mygamesonline.org/6219636043.pdfIn PDF document text
    • http://erogan-oficial.site/ways_to_feel_better_after_overeatinggfh4m.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/ihaoY1L/38486693093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_60306c6f9066b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421214/normal_5fe03a6e1e79f.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/D31Iij0/net_framework_3._5_win7_32_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/cijmE4H/44198903966.pdfIn PDF document text
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/kigasitaponoxe-sijozunifef.pdfIn PDF document text
    • https://wadaxoleda.weebly.com/uploads/1/3/5/3/135311928/440328.pdfIn PDF document text
    • http://smotrikino.fun/crontab_schedule_format_in_linux4nlk6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_604d15a2b6371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_5fda8e7ef1beb.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_off00017569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17569 5492 bytes
SHA-256: 20b82c7b65349a182e86665845a95496df90f453421208e988e84a58498b134c
font_01_sfnt_off00018821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18821 13044 bytes
SHA-256: 22285b6334c996dfa85b2d0666316f98354cd76205bef722e43761b83bf4ea6f

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