Malicious PDF — malware analysis report

Static analysis result for SHA-256 180a8b996d4cd99f…

MALICIOUS

PDF

87.6 KB Created: 2021-09-17 16:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6273db357a692888399185f40b077a7c SHA-1: 108f1b302c711761a1f3ea99000d6a3a1e974161 SHA-256: 180a8b996d4cd99ffcc0cb2a7ad3d92969b0f25345326718bd65419e056b0df7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to distribute malicious content or phish for credentials. While no scripts were directly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://steakclubhn.com/campannas/file/78306313450.pdf In PDF document text
    • https://trystsalonri.com/images/file/82358481068.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/39763314751.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/binosibunevakiwafitufisu.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/zunezuxaf.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/nitotasejonotog.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/relezinagujapidipapivod.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/ruxokamurimefixekame.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/5382198243.pdfIn PDF document text
    • http://pneusmarene.it/images/file/47354186421.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/5025379698.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412030b02f4---7357588867.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614033dce60e4---85839560610.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/56869337658.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/24119474073.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210907120511040.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/moterafevawuderawukarus.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/23291077335.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210913150839430.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/52214660147.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/87556249204.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/810117669.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/10460836176.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/42077309030.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/zibegugelivaxinilaxo.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/75557229474.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/jumofapeguvuserirekusekox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=la+mejor+app+de+edicion+de+video+para+androidPDF 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_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 10516 bytes
SHA-256: 1b993447656ab83e5ea76a9c22d377c40a46d92da321f361701678f65f4eae82
font_02_sfnt_off00011be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 19648 bytes
SHA-256: 95fb2727bad79be9ce0bb4577893001a33fa71d1354dcb790857881ef5751725