Malicious PDF — malware analysis report

Static analysis result for SHA-256 501d4cbdf55fde99…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 08:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b3cc3463c33e5709e4edc0bbde2b78a SHA-1: 88f2abd93bad076b78a52440d95a28112d5d88ab SHA-256: 501d4cbdf55fde99076724b51ceffe471b75132be7ff83c2d5cde310cd0897f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links pointing to a large number of distinct domains, many of which host other PDF files. This behavior is characteristic of a link farm designed to obscure the ultimate destination or to distribute malicious content across many sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://epgeptech.hu/ckfinder/userfiles/files/72157128320.pdf In PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091003221011355.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/tuzazojafufupevuxon.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/96379188663.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/tenivokakiruvaxuweralu.pdfIn PDF document text
    • http://talleresjpg.es/img/file/likepeluwamasorizizax.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109092251398808.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/38109282767.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/61804798999.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/paziwozogijez.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/25185294224.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/jiwagosenejimeviba.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/61217125239.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/dusejuwadefebelugonopixu.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/foxesevesijomokanalelopuv.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa15393b2---bujadukuvujujabig.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/34013365909.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/61056278738.pdfIn PDF document text
    • https://fuoriscena.eu/file/57634371787.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/bewak.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/16832652994.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613666c52caa6---75184505155.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/wubovulebuf.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/131236258664.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/11661860970.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/jiroxigefogoradamad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=zune+player+apkPDF 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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 10036 bytes
SHA-256: 24efae98b157230d61777b23ccdee127aaac5641e4c0eacd5028350e81d90e56
font_02_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 17512 bytes
SHA-256: ef7fa477d66f29fadc5a5a9ccd4d8eacedfb086cb42e9e14a3d4e12895995b39