Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cae1effe642b23c…

MALICIOUS

PDF

73.6 KB Created: 2021-09-28 03:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 61906829f78a162e60e976874a9df61d SHA-1: 6047714b266f6107f3c95bf64c2f40220f43552a SHA-256: 1cae1effe642b23c535f8cde7df929f7b7610ce531d863c2f013918ada46ba24
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it's designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/fovidinusamuxazim.pdf In PDF document text
    • https://drjou-vc.com/upload/files/51931834831.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/kaxixanagip.pdfIn PDF document text
    • http://garderoba.sk/images/_file/xibobanafazosoliralad.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/1974212944.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/netebatotimiti.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/895eceacc85d947b215b3d5dd86997e3/8225267861.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/20605538486.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/gomadi.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/wewobu.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/52876376158.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/81087200761.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/bemoporusuvibawejanob.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/58329696675.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/pukujibuzuje.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/matojezexuragizozil.pdfIn PDF document text
    • http://mousike.it/img_ins/files/vuxipojasevupuj.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/38086691795.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f5da6cc14ad8e533508477888cd2103f/judakidexumakiriponesamo.pdfIn PDF document text
    • http://furniture83.com/upload/files/41359529368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=youtube+video+downloaders+for+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_off0000b787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB787 10724 bytes
SHA-256: fd85c9cbaeea67cb3a7bc6e0d7f76ccdf7fc53c3a339a5d3d98d42534d729432
font_01_sfnt_off0000d059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 18780 bytes
SHA-256: d5db50c26eae5d6f752e03d09b5e5572081afec2e29ad64a320218b703561abe

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