Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ea2a04b54e66c0…

MALICIOUS

PDF

93.1 KB Created: 2021-04-07 23:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c696be64e7f1cf6d274351634ed2cac6 SHA-1: 680f4cac2b4567f789fd20eb23e895d9703db343 SHA-256: 80ea2a04b54e66c024e3f90aeb9d75d0609edd70e5f1a71975cafe2fd73c3fee
142 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of external URIs and a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains elements that could be interpreted as lures, such as download buttons and urgency language, which are common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/strik?utm_term=jlab+jbuds+controls PDF link annotation
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdfIn PDF document text
    • http://zabozukatipu.iblogger.org/37045981948.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/ijhcifp/multi-_multiple_accounts_app_for_android.pdfIn PDF document text
    • http://pesetatin.iblogger.org/hasil_bahtsul_masail.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/icTZgeA/tamil_love_songs_kuttyweb.pdfIn PDF document text
    • http://julubavixukab.66ghz.com/nick_saban_explaining_the_process.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pifazudiso.rf.gd/88118556028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d0793f-7292-4b3e-8460-e26f19bcbdf4/65090608015.pdfIn PDF document text
    • http://minapisifiret.rf.gd/67516025400.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_ce411c407a5b4fef9f6baba29f7bc256.pdf?index=trueIn PDF document text
    • http://zisoramemib.rf.gd/associao_de_resistores_exercicios_resolvidos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec3e1d5-3837-4a00-8967-2b3946802df3/redexujudugesazuzogadix.pdfIn PDF document text
    • http://xovojiga.epizy.com/comparing_and_ordering_whole_numbers_worksheets.pdfIn PDF document text
    • http://lekukezasiva.rf.gd/jolly_phonics_games_cd_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac81469-9dd0-477b-ac99-a4d92425a52e/43092352655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a2e133-f815-4640-9ead-650f7d598ee3/10951373784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93cc9623-fc04-4ebd-a7c8-f809096b5487/bd-j5100_blu-ray_player_manual.pdfIn PDF document text
    • http://lunupesefobe.rf.gd/96807763926.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/eu4_vassal_swarm_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/demolay_7_obligatory_days.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/xifej.pdfIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_16a9ed55409140108db4b73877737ea9.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_off00012800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 5140 bytes
SHA-256: 295865bf6c9bcbcd30b87eb9b3c79e033d73f8e92c6a01a82254242562cc9f17
font_01_sfnt_off00013986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13986 14256 bytes
SHA-256: 6be5cb6253b3e405b7fa836b8080af55f60e9984db0b878f45358d6edc18e3b5