Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d31b7b12f77331…

MALICIOUS

PDF

76.4 KB Created: 2021-03-02 14:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4caf4d6738be3d3f3b1d06a85f5992b1 SHA-1: ad9484df55a92c5caab11b34257ad5f3651bc00f SHA-256: 95d31b7b12f77331db732195ea7686937382d3501ca0a071fb3923490d82ea27
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

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://bologen.ru/wix?keyword=khudgarz+episode+11+and+12 PDF link annotation
    • https://xasejudezorakoz.weebly.com/uploads/1/3/0/8/130813307/4445302.pdfIn PDF document text
    • http://ropewelopison.iblogger.org/reported_speech_exercises_test_english.pdfIn PDF document text
    • http://milanbeach.fun/english_speaking_learning_youtube4pdkv.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/kazasadefigovarovovikaxi.pdfIn PDF document text
    • https://wedemewimobuxet.weebly.com/uploads/1/3/4/3/134309086/24f9826869c2.pdfIn PDF document text
    • http://1xbets-regs.site/nipasevilunasebuxabeteri7mcd7.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/6GiepMg/army_builder_games.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/ji3Qha5/taronesokupapafavabinem.pdfIn PDF document text
    • http://pe50off.pro/applique_pressing_sheet_spotlighth8jlb.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/ig5ibhi/free_app_to_draw_woodworking_plans.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/jgZDNia/40592085200.pdfIn PDF document text
    • https://jikudirag.weebly.com/uploads/1/3/4/0/134040407/pinagobizexan-lajoxazegutulat-vovis-joxojivosut.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://s3.amazonaws.com/gewuwasi/like_water_for_chocolate_summary_chapter_5.pdfIn PDF document text
    • http://nodefojabotozij.rf.gd/medical_laboratory_technology_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/gukisajukewewowugu.pdfIn PDF document text
    • http://dukedofabi.epizy.com/zilafa.pdfIn PDF document text
    • http://ledojefuvase.rf.gd/zusugek.pdfIn PDF document text
    • https://bit.ly/2vwQ8b1In 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_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 5196 bytes
SHA-256: 7cc7341954a61cc17f0ba9b1e8081da2ae2ded81ae65956a0705f1a1569be998
font_01_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 10052 bytes
SHA-256: 55313a49a196715f5ba652e2079b1a66ecd888fdf92639cdb2ee0ba2b249a135
font_02_sfnt_off00011620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11620 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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