Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb7996166b853bb…

MALICIOUS

PDF

79.2 KB Created: 2021-09-23 13:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 856dbb4aef80759d3f5877da597b0124 SHA-1: 109ae6f4dc2cbdec77288a79f5734613a9e4a529 SHA-256: 1cb7996166b853bb103d9fc3416d985f4bb9f77c71f29c191829daab1d95b3e1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to redirect users to potentially harmful content.

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 http://lianbang123.com/uploads/files/202109051346004147.pdf
    • http://bezagsecurity.cz/userfiles/zitotavakoborifebategoxis.pdf
    • http://mictrogiang.com/userfiles/files/makagobogapelaxebi.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/77ace89dadd4db96a5042fd33994da25/11981153389.pdf
    • http://kimdaiphatsteel.com/Images_upload/files/31615379151.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413157864b0---15811305688.pdf
    • https://archielectronics.com/userfiles/files/57948659871.pdf
    • http://aedjtjdshbf.pretty-match.com/upload/files/2255431750.pdf
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/suxowobefemesulafo.pdf
    • http://restauraceeverest.cz/userfiles/file/68411615522.pdf
    • http://carrozzeriabosini.net/userfiles/files/makikakonivenu.pdf
    • https://soenen-pneus.com/upload/file/99411502953.pdf
    • https://acmfashion.vn/uploads/files/zoleki.pdf
    • http://bilcafe.it/userfiles/file/38024290560.pdf
    • http://ahzgbh.news-read.com/upload/files/bepowej.pdf
    • http://velocimapper.com/webfiles/file/fitagajix.pdf
    • http://proficlim.ru/public/userfiles/file/natetusuvorit.pdf
    • http://xhiehchin.com/Xhieh_News/_file/8193695095.pdf
    • http://carlaschroyen.com/content_docs/49588429636.pdf
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/23405873058.pdf
    • http://colantuono.it/userfiles/files/xawus.pdf
    • https://myvideoclasses.com/ci/userfiles/files/mojiwipabagoveka.pdf
    • http://vaynhe.com/upload/files/puvotugiwixalu.pdf
    • https://elearning-chemistry.ro/userfiles/file/86285246387.pdf
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/14542069408.pdf
    • http://dylogistics.com/userData/board/file/gilinezame.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=madalin+stunt+cars+3+smart+driving+games
    • 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_off0000d08b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD08B 16792 bytes
font_01_sfnt_off0000e8a2.bin
e567c7b0f54b5e70e2cd23c0e999e47e3b28362918f9cdabde27405ebbb7c91f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 10924 bytes
font_02_sfnt_off000101c3.bin
d5fa4d9844760f544de316c45944990a6585b167ba8af12a1a037b88ab0af918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 17296 bytes

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