Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce41622c97196e3d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 08:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa7cfacabdf494b6bf76ef68c37b278b SHA-1: 966b81708f922bfc1746df7c730e79c828d6ecba SHA-256: ce41622c97196e3d61fc7e24592e48a903e990890f7ae8e31e8bdd976e54ea62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains and configured as a link farm, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://tasteofruraleurope.eu/upload/File/64139600894.pdf In PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/29838764460.pdfIn PDF document text
    • https://protrialse.eu/files/files/samimegogigux.pdfIn PDF document text
    • https://petribax.com/userfiles/file/29886476469.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/70559817501.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda3ebb688---geber.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210902003349.pdfIn PDF document text
    • http://financesnadno.cz/upload/file/18796974542.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/85912818957.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/38971019295.pdfIn PDF document text
    • https://blokhol.com/upload/files/46596989775.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109031030546366.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/69244635395.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614685fe9a67e---mogekefogibu.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/7097023181.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/bowupige.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/12210835469.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/90155446557.pdfIn PDF document text
    • http://iucecb.com/files/file/25080062646.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/97981357485.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/tumavojumokonegep.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/47713049152.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/97278281451.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/69388139790.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/memetinujod.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/41928987473.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/depofedemad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=top+hot+korean+actressPDF 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_off0000b5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF1 10388 bytes
SHA-256: c9a53f83e56e7539ddce278ee36571ad238749701466147d62997988736a1afa
font_02_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 18020 bytes
SHA-256: 9a1587127ae287ab645645f6dad706479efc00499f48da947fcdc313035af8b4