Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4af7f006e15ccc3…

MALICIOUS

PDF

83.2 KB Created: 2021-04-10 01:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c9042a86be60394648d999d51c72975c SHA-1: df022f55bbcd1ce8c2de481d28c29e357719fa3a SHA-256: b4af7f006e15ccc3235c993fdb06114f73747e7c0137663fec4d816e8da88e02
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one pointing to 'https://resalured.ru/strik?utm_term=burn+your+portfolio+epub'. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://resalured.ru/strik?utm_term=burn+your+portfolio+epub PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422382/normal_5ff662d0d764b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_60586823b91fc.pdfIn PDF document text
    • http://formblckr1.xyz/gazegudatasowiryu100.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385634/normal_5ff975c875f04.pdfIn PDF document text
    • http://savadaqwe.space/music_streaming_software_for_androide36ds.pdfIn PDF document text
    • http://itnegozio.info/2251779312vhcct.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_f1fd8e7420e1447f822e96255ee62ac3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/64609974470.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/dhadkan_bhojpuri_video_song_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/is_braun_series_7_wet_dry.pdfIn PDF document text
    • http://buwaveb.rf.gd/63196670505.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/29880749891.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/anime_wallpaper_master_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/xutepalinepilakigoz.pdfIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_9d5d4b61392b43a89a82acffbc1c404e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/statistics_for_business_decision_making_and_analysis.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_653b275fb03845a1a214a30ea4293023.pdf?index=trueIn PDF document text
    • http://jejotatimub.rf.gd/process_of_ecological_succession.pdfIn PDF document text
    • http://fezisiw.epizy.com/delete_blank_page_in_adobe.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_67c72b0365914252879a0602f3cd68c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zexozavo/bebanimejabeduzeki.pdfIn PDF document text
    • http://boraxijud.epizy.com/anari_film_song_songspk.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_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 4800 bytes
SHA-256: 90787807444aa39fef6ad66d2e7f0ea232e8cba3263a6b24792502d85f2e6854
font_01_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 13396 bytes
SHA-256: fa27651ac2995dabf1bc1618882c356c7106d7acd648fef8d699020a72746926

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