Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e72d93449459bcf…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 08:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3eb64d0455d2f46bfa6905324156c591 SHA-1: 4ba78243073d8ac8666352859c256bda55fba802 SHA-256: 4e72d93449459bcf4b3c666c572486dbda230537c469b066497825be6b1f0669
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to what appears to be a link farm hosted on disposable domains, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of embedded URLs and the overall structure point towards a phishing or content distribution scheme.

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 https://infrive.ru/uplcv?utm_term=minecraft+classic+html+code PDF link annotation
    • http://studioguatta.it/userfiles/files/2949948477.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/kupobitixax.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/95033256560.pdfIn PDF document text
    • http://haki.vn/uploads/files/54005414452.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/wivoxedisenekiberuvesul.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/37376638309.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/49757172123.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/832e0f473270fd156f972c9b311da1f9/renebebaduroxulofub.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/61222522910.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/28872269252.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210908065051.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/95568012821.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/61422048497.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4d980bcd72a9f5397e6b7401368376e9/siwavevuj.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/36076158313.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/zamikigo.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/34613500135.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/vomigote.pdfIn PDF document text
    • https://masukpt2.com/contents/files/75670832129.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/mekigatebelazolud.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/nimudozokukewurir.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/57632418684.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/81636802949.pdfIn PDF document text
    • 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_off0000ca33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA33 17672 bytes
SHA-256: b53f154017f7da64921e88e0bbd586e15492ad208bb171c5150b73cdc3c8cbde
font_01_sfnt_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 10732 bytes
SHA-256: 15a7ec294ff00e5113b5744db3ef10be06d3261cf13112178ea3199b82e3e602
font_02_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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