Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84e5a73b47e3877…

MALICIOUS

PDF

68.2 KB Created: 2021-09-29 15:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9fb09ca36b6e16444c75ff224f2f6e07 SHA-1: 91ab3802a693a3a52bd142654c9117801c546e2c SHA-256: f84e5a73b47e38772261921ec6c64cece6c5796e7b16ba500d5a69e29c848423
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malicious redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on low-reputation sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://smidgel.ru/uplcv?utm_term=the+cw+apk PDF link annotation
    • http://www.vikingmaterials.com/img/didosamazolojogesilakiza.pdfIn PDF document text
    • https://cardolf.ro/files/davelot.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/30855919266.pdfIn PDF document text
    • https://5uempat.com/contents/files/vekumutevobajojuvorigis.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6c42cbd82cf793f7299d47b82391c96e/42464396359.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/mujalelonibewugekava.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/vokepujutijovijaguk.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/pevemilutus.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/85344720472.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b7a51c6baf5a5180d45d5db7ed2872cf/fopilafogaje.pdfIn PDF document text
    • http://guchen.ru/d/files/wajogokinuvu.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/29870382875.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/gebopezewo.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/badulunuwisawegukanoxig.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/69533578848.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/10177574890.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/80345835952.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/xevupezewumibatenido.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/zigowexusutim.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/ledudozala.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/35036996850.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/13155312976.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD4 9884 bytes
SHA-256: 0cac8601dbc5935edfc6745c6deaef17cb13c308f00750db495f7b3165a1896b
font_01_sfnt_off0000c2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 16040 bytes
SHA-256: 09bcd3764d477cc01808d8ed14654da0f1363caea16510c369676775c204bcda

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