Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d4983636995734…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 21:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1feb335fdceb0cabf2e8641a70f9ef4 SHA-1: e0d728a0f6472c87dbd25f507ea6f1a56726211b SHA-256: 44d49836369957348b77c12065e2b1f321401b15eb8def9bb3ae3a2b4c681e51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. While no scripts were directly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://shuimotongyuan.com/userfiles/file/57072779176.pdf In PDF document text
    • http://geometrarontani.it/userfiles/files/32183305701.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/zogelufematikek.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/50491822402.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/vaveb.pdfIn PDF document text
    • http://regmac.net/userfiles/files/mevuvulatolujetaril.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/xefekavo.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/ribazafawurisazuder.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/38767771768.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/sofemenamelukuroxuv.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/notiwubimuv.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/e3df5798a7868fc411d033b70e44781a/63087867578.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/wefozipabuf.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/vitidijemite.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/26361928148.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/neledexasepaxabimevo.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/iebmpljds4nd08ruohn8f7eih0/vunujomanajudopigadirog.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/fibarut.pdfIn PDF document text
    • http://coachhouse.info/assets/file/55100403210.pdfIn PDF document text
    • http://bronia.org/userfiles/file/97744671169.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/29873489153.pdfIn PDF document text
    • http://sdes.in/uploads/vibaginuxid.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/20/20874855703.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210906_A5E7049EE85402B1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=xiaomi+wallpaper+appPDF link annotation
    • 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_off0000aed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED9 16136 bytes
SHA-256: d7855855b7cd5413a571f6ec1589f1b41652484eb050f82c8d30b057f035c989
font_01_sfnt_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 10136 bytes
SHA-256: fcddbab565b6ac154515e321cd7b9084bc065b199425dc89770691d3ecaf20c9

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