Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5306832924b28d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 00:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50521b3aa4274946b9f38d97a73a4942 SHA-1: 3b65717c004d21a1041115eb09747d0869c2404c SHA-256: bb5306832924b28dca5459d2222830d5d3cd5222a82a35c73da0c36d0cc08b80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with a heuristic identifying it as a link farm hosted on disposable domains. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://saxonrt.hu/img/userfiles/files/41779611681.pdf
    • http://boekenwinkelindex.nl/images/uploads/1440204133.pdf
    • http://nontaromclinic.com/ckfinder/userfiles/files/rafarazopurotas.pdf
    • https://ourlady-schools2.com/userfiles/files/xebinig.pdf
    • http://hepiran.com/cache/fck_files/file/lagadekid.pdf
    • http://massimosusto.eu/userfiles/files/22892532842.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/dacb3ca0f63c11cae899eb3128be85e2/99638116537.pdf
    • http://lnimeina.it/userfiles/files/56103057900.pdf
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/tajibefafig.pdf
    • http://sapientgenerator.ru/files/userfiles/files/84241392558.pdf
    • https://ww150003.linebot.net/upfile/files/20210904065441.pdf
    • https://frigosztufi.ro/ckfinder/userfiles/files/nopizuzetufudofasera.pdf
    • https://srinivasagroup.com/ci/userfiles/files/19548242128.pdf
    • http://farmaciafoglia.eu/userfiles/files/6319560407.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/xatuninuliduno.pdf
    • https://fuze-pay.com/ckfinder/userfiles/files/98361689370.pdf
    • http://www.petersonassoc.com/emailimages/file/nenenu.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/xekibinalesogadubumi.pdf
    • http://belloverde.net/emailer/file/25519898336.pdf
    • http://stisk.com/file/ledojomaze.pdf
    • http://seychelles-resort.com/images/blog/file/lidivoxisozufuwere.pdf
    • https://rm-parketi.si/uploads/59359199641.pdf
    • https://ht-cooling-j3t.com/contents/files/52904536885.pdf
    • https://habrit.tw/ckfinder/userfiles/files/zurerakuboturubewig.pdf
    • http://bindashnews.com/userfiles/file/gulakuxekek.pdf
    • http://mgbig.com/upload_fck/file/2021-9-3/20210903082650876575.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=videobuddy+apk+2021
    • 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_off0000c358.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC358 16792 bytes
font_01_sfnt_off0000db6a.bin
deb921c46037e7f8892960a456b31e2e1324340ac4c80e658d67fd3ac2b7acd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 17676 bytes
font_02_sfnt_off000109c7.bin
55ce03d410cced475e3ff7b94d206dba87381c60ec4d7136c218a578c60106a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 10580 bytes

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