Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e19b9267d191bd3…

MALICIOUS

PDF

68.0 KB Created: 2021-10-01 14:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d7d81d66fb79ae440988410c2a8194ba SHA-1: e1133e4ec85f0b252122dd182a64934d78bbb6c7 SHA-256: 3e19b9267d191bd3c40aafabb07d560a19041fca808fdddb957a4819141c0667
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://inmaabiladi.com/userfiles/files/retafilegegazavemomu.pdf In PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/zobeguka.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109111854114098.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/lulujelolu.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/64427882547.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/lakifenedesivexu.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/88379011302.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/38959061955.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615404cd5e7b6---9752533651.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/51976500185.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/tokoxetedizolowal.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/74243954673.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/21980563687.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/wowekuxajoburun.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/butixudegasasul.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/ruxodopibolosefe.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/80137133665.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/80129949457.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/dunusimimolokexasivefezop.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/pimuxodaludotogebexolovi.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/pupudap.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/lasogapidedimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=main+muscles+groupsPDF 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_off0000ad5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5F 10712 bytes
SHA-256: 36242521e6fd7d49f8773d9731133bb32980dd37ad2d195caf5187bc4eee7304
font_01_sfnt_off0000c5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DC 14712 bytes
SHA-256: e6b2fb18714f7b81a1fc755b1c0b76aa6744b97cefb548701442858467cfa536
font_02_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1