Malicious PDF — malware analysis report

Static analysis result for SHA-256 2836d555fdb18fe2…

MALICIOUS

PDF

87.9 KB Created: 2021-04-09 21:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1cd92e17181d01924be59cfea07a9712 SHA-1: a97f8e0afade982f7ae5b618cf7920bb10d4cbae SHA-256: 2836d555fdb18fe2f95b92ac99fad09df751d194296aba66d2ef6fb51b356128
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://soxebez.ru/strik?utm_term=why+are+my+wireless+headphones+not+connecting+to+my+laptop PDF link annotation
    • http://vkrowl.com/91241668356wrdw9.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/mosugoxenunuzex.pdfIn PDF document text
    • http://yoga-fitness.space/color_chart_hair_wheelo5dp3.pdfIn PDF document text
    • http://retamos.mygamesonline.org/fejewinakoginominutidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_606797ad6f64a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_606d5ae4b2ea1.pdfIn PDF document text
    • http://sepukolobu.sportsontheweb.net/que_es_un_lider_populista.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5fdaf9bf44837.pdfIn PDF document text
    • http://reduslim-siteofficial.site/59662954976ufcr6.pdfIn PDF document text
    • http://pewezeje.22web.org/8661731894.pdfIn PDF document text
    • http://bisipatelaloguj.66ghz.com/continuation_sheets_paper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369179/normal_6008457a02b3d.pdfIn PDF document text
    • http://plsale.pro/model_3_range_drop_after_software_updatewcir7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_5fe5b87a5b3546aaa22b13f64f01dadb.pdf?index=trueIn PDF document text
    • http://releboxodaw.rf.gd/75948794844.pdfIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_d97e20bc3b3b4eb895eb6c628a3644a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazemi/sqlite_editor_apk_latest.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_d7ea8b3711b64e228575a8611f9832e3.pdf?index=trueIn PDF document text
    • http://pupogoxegaze.rf.gd/school_uniforms_should_be_banned_argumentative_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/vizelenodedaxuxibumotok.pdfIn PDF document text
    • http://nuwuzokapa.rf.gd/sab_badhiya_hai_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/earn_bat_coinbase_answers.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_3bc5c650180246fcb1108c8c5112cce1.pdf?index=trueIn 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_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 5696 bytes
SHA-256: cfbb516ed2ad07d0211f4a5865c5da2253e7de8d0c74840c7b9adc9e5bfbed20
font_01_sfnt_off00012e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E34 10560 bytes
SHA-256: db81aa42167cad96f75b18aa1585694f1291f298e42b9db81bae5af4cb631482

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