Malicious PDF — malware analysis report

Static analysis result for SHA-256 7762ce9105e2359a…

MALICIOUS

PDF

77.3 KB Created: 2021-03-23 21:04:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 78da07aa28bd33450ff8369d3e23f600 SHA-1: 50339b20e63eb5ec1273d5bb4b4e7bd8cb7a0341 SHA-256: 7762ce9105e2359a8810f6daa169f8ef546be68555a788a4ccccaadcec45f150
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 0.9998

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://gimoguvi.ru/aws?utm_term=what+is+the+definition+of+communication+skills PDF link annotation
    • https://cdn.sqhk.co/zuxosutuku/efsTXTR/zaxaxomejunufuret.pdfIn PDF document text
    • http://wovegibexakebof.iblogger.org/grepolis_report_converter_firefox.pdfIn PDF document text
    • http://butesevoniluru.iblogger.org/gadolawelesumom.pdfIn PDF document text
    • https://fagojature.weebly.com/uploads/1/3/3/9/133987822/metusunami_rikaf_kepakozigiv.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/1ihXEkT/10521921417.pdfIn PDF document text
    • https://xugeguva.weebly.com/uploads/1/3/1/4/131438310/5267bc50c2.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/GhbCGic/zevelolujulebulumoken.pdfIn PDF document text
    • http://gegigozigox.iblogger.org/37485180096.pdfIn PDF document text
    • https://cdn.sqhk.co/ziveluki/MMifmHz/splendour_board_game_rules.pdfIn PDF document text
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/vidobuzixa.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/mejifavo/83359859213.pdfIn PDF document text
    • http://sobavetugobi.epizy.com/warfarin_initiation_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/candlestick_charts_in_google_finance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e7cfa5-20f0-42d2-a276-6643fba90762/something_like_this_gordi_lyrics_meaning.pdfIn PDF document text
    • http://zukopeziwegufu.epizy.com/kovogowetuxozemajebixatag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2425a987-5767-4014-a20b-02feb6d3c2e8/60025763431.pdfIn PDF document text
    • http://gogolozumer.epizy.com/demazudizek.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/event_debrief_document_template.pdfIn PDF document text
    • http://vimitafukufes.rf.gd/engage_new_york_math_grade_1_worksheets.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_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 5240 bytes
SHA-256: cdfce3bea328515434b69b7e8411ae8e26b029e74fa466789f0c5a0752de4477
font_01_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 10664 bytes
SHA-256: 136dd31c4e5d4872f3c78e01bc1170b039fb286b3b43fdc63df32db0d87029e1

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