Malicious PDF — malware analysis report

Static analysis result for SHA-256 345549c40f020d8f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 08:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d843464ead38f56a370221d766617519 SHA-1: 2308533aaca95e25a1850879c7f7ebdfc1e0469a SHA-256: 345549c40f020d8fe586cbf401cbab024696b0f4580952c5a42061324bddf8ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and embedded links point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vinaktv.com/storage/ckfinder/files/49046781260.pdf In PDF document text
    • https://hongdung.vn/ckeditor/images/files/solibunug.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/42172927922.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/43183894196.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/tesarunuvetuxowozular.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/51975737411.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210914014408961002wg91eakernbp.pdfIn PDF document text
    • http://koutingchina.com/upload/files/tugogolibozuka.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/62103227234.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109161436363748.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210910011649.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/zezelomi.pdfIn PDF document text
    • https://huanghecables.com/d/files/21839243678.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/jipekixi.pdfIn PDF document text
    • http://exima.kr/userData/board/file/jajodasased.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/54882688426.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142518908a27---389908390.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/26788748657.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/bisokanaduzurud.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/47e82fa4e9c4b6f0237e58abac1abc20/fekodideve.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/xavikizilivufubekutujuvu.pdfIn PDF document text
    • http://falerisztika.hu/tmp/nobujonigogagesavizizaf.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/jewefoxetamaxaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+gta+accountPDF 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_off0000beb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB8 15348 bytes
SHA-256: 42e5fc66bec74e8cb43b30f9ca52513179d6aef13898832faf1b35f0c259ac1f
font_01_sfnt_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 10176 bytes
SHA-256: 3a67081cf334cb996f20dd2c3249d7e7829dcf3ee630dcb8f9667300c0210bbb
font_02_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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