Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61ef46ea23eedd1…

MALICIOUS

PDF

73.3 KB Created: 2021-02-27 13:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b1d37c4a39000cf305368870528517c7 SHA-1: bc78cd03e3666d71a06ae2d8a296040d261b72a9 SHA-256: f61ef46ea23eedd15bc4ad12957737d1735a5b8eea30a2e46aef79bca4c99d2e
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=how+do+i+work+my+keurig+machine PDF link annotation
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/f7de5a0.pdfIn PDF document text
    • https://rapexukiwivusa.weebly.com/uploads/1/3/4/8/134856806/xepenuvuti_kazafazava_kezifap_vapuniked.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/namenuxi_resaja_jozebi_kofagadolon.pdfIn PDF document text
    • http://pokuwasu.iblogger.org/which_is_better_zotero_or_mendeley.pdfIn PDF document text
    • http://gesizuwumog.iblogger.org/jinanosonet.pdfIn PDF document text
    • http://jagefefixod.22web.org/30806460525.pdfIn PDF document text
    • https://xedijekotaz.weebly.com/uploads/1/3/1/6/131606072/3949907.pdfIn PDF document text
    • https://razavojukuraw.weebly.com/uploads/1/3/6/0/136090857/kiwepafeku-jopikudawejexe-lagatuwisuduki-xiketogaxageja.pdfIn PDF document text
    • http://pisodanijuke.iblogger.org/boxing_star_gym_guide.pdfIn PDF document text
    • http://gifazat.iblogger.org/82115550342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megelugik/duxurolin.pdfIn PDF document text
    • http://tituroxir.rf.gd/cellebrite_physical_analyzer.pdfIn PDF document text
    • http://mebupeb.rf.gd/ios_12_notification_bar_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/circular_motion_and_centripetal_force_worksheet.pdfIn PDF document text
    • http://wuwedutukuw.epizy.com/nazozivejurifijuzuxor.pdfIn PDF document text
    • http://firixafuzive.rf.gd/ponatisijilotuzabo.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/62001820440.pdfIn PDF document text
    • http://wuxodiza.epizy.com/track_fedex_package_by_order_number.pdfIn PDF document text
    • http://daxepusiz.rf.gd/k7_laptop_antivirus_app.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_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 5364 bytes
SHA-256: 65fe4e3a52fc087d17183702ab4178bc7d59dbc703a8e8be2f75fe9e3a6dccc8
font_01_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 10928 bytes
SHA-256: 483ffcaecace63cfd38dbb748069f7f56d4649931d27077690c9175ff975d791

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