Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1340fe400c39fb4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 23:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9da2378bd7ddf19947dd2294fdc95f2 SHA-1: 46b41214f2a31e75a84f3594b439f341708a051d SHA-256: c1340fe400c39fb4118b3234c55f9f02c52780250c58c24200c87fc51411b530
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=full+comedy+movies+bollywood PDF link annotation
    • https://abriganature.centralcms.cloud/galeria/files/69889940737.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44244306915.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/fawusum.pdfIn PDF document text
    • https://envirotechindia.net/admin/userfiles/file/walovapewosa.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/babozanurejufolazis.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/76986270113.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/leradigu.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/kalitigoti.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/wanefepuvixojeladov.pdfIn PDF document text
    • https://msiutilities.net/documents/rewopinenomamuxu.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/bifapokapiju.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/lobanizebufadefodotesunug.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/11315646785.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/vojeru.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/23884905643.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/xoveposenuzusekozol.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/19745245770.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/83396824379.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/saluvozeveg.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/10943567241.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/4318892284.pdfIn PDF document text
    • https://peterdegendt.be/file/17311155640.pdfIn PDF document text
    • https://ilo.tasksplan.com/userfiles/files/10958971629.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/5542448616.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/68350731711.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_off0000b36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB80 15260 bytes
SHA-256: cd8441e28b68eb6d8603255b98549057b6da03d05a771b7e7aa07ca1ecf0d402
font_02_sfnt_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 10552 bytes
SHA-256: 3d064a2b72a0f4f8beeb9617af2bfa2649c9c0d45a31808f98c11eda8bc5f78a