Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc33e34b12b017d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 17:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b006966f449986849fc51ea87bda3023 SHA-1: a604c9f514ccf4562a20557af6367d9f5ed8f6b3 SHA-256: bfc33e34b12b017dd274ae51e3b39ed1b9c40366e810da56f2ddaa349749888e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document but rather a mechanism to manipulate search engine results or distribute further malicious content. While no scripts were extracted, the sheer volume of external links and the nature of the heuristics point towards a phishing or content distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://shriramsteels.in/public/ckfinder/userfiles/files/67978945948.pdf
    • http://topmebli.com/content/xuploadimages/file/74462480284.pdf
    • https://mps-india.com/userfiles/files/29006541980.pdf
    • http://luisacortesearchitetto.it/userfiles/files/telamizukirudodaxevirus.pdf
    • http://canigrup.com/userfiles/file/vapif.pdf
    • https://mehreganimaging.com/images/upload/files/mutodaregasopav.pdf
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/43430131710.pdf
    • http://gewald.ru/content/Files/85783072551.pdf
    • http://irvinenott.co.uk/ckfinder/userfiles/files/tixirumisoge.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/7065955130.pdf
    • http://mijn-nederland.nl/userfiles/file/ginekadevuvapu.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6fa5bc3808428b7846b00e8619593a74/golusujosubosavugez.pdf
    • http://drentmedischadvies.nl/uploads/files/62509607500.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/lurubupeta.pdf
    • http://altronic.pl/!mag2011/userfiles/file/gaxamalixakov.pdf
    • https://nationalshield-uae.com/userfiles/files/puneruwu.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/45946097933.pdf
    • http://studioarchterreni.it/userfiles/files/19933524314.pdf
    • http://czdashan.cn/uploadfile/file/2021090500231973499.pdf
    • http://xmst.com.vn/app/webroot/uploads/files/gezujolegajileku.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138508107353---46096102694.pdf
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/72213177902.pdf
    • http://ranch.pl/files/file/mimiloxunimo.pdf
    • https://buddhaart.in/userfiles/file/33925904957.pdf
    • http://phanmemerp.vn/attachment/files/29168741007.pdf
    • https://essuances.com/ckfinder/userfiles/files/xigavotubowigenoluwuri.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=shs+core+maths+textbook+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 16792 bytes
font_01_sfnt_off0000fe12.bin
c4800afbe97719b475a22c2b78580e6215131f06892d06fb3095c6d7a0335486		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 11052 bytes
font_02_sfnt_off000117a8.bin
3d5bfa1721c0333077a0830644e8d2334a2da5e5a6219ba7503e60dff698fcea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 18244 bytes

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