Malicious PDF — malware analysis report

Static analysis result for SHA-256 16af8237ec763328…

MALICIOUS

PDF

73.8 KB Created: 2021-09-09 14:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3ad1d21096d17493666ddbbd1d0bc83e SHA-1: bd40235429b9da5abd05c27e553e2a87105f4341 SHA-256: 16af8237ec763328244f129c4838f5c0300df0d24d15f26cdafdde7468c58c4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://leylatoprak.com/userfiles/file/pesojisexinusojuri.pdf In PDF document text
    • https://tenekedjieva.com/uploads/file/26233359866.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/zewip.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/gonunovijapokajoranufuneb.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/88199343736.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/zosujagesuniligezaxoto.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613692cdf0582---finimulasawawebesuw.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/nekunobexazab.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/87484139042.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/16136726358.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/fenunoza.pdfIn PDF document text
    • http://carbonelite.ru/file/92671829537.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/70353981382.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210903_163507.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/16154010956.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/29514823773.pdfIn PDF document text
    • https://digireg.gr/upload/57617024503.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/34777867306.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/81349674731.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/popobulatuzunitonases.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/35007590847.pdfIn PDF document text
    • https://777mto.com/contents/files/80405564997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=infinity+flight+apkPDF 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_off0000be14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE14 10276 bytes
SHA-256: 993b092b6c86bae8e9992226be1df7ede9f63e497c43b52b09a1c353a791a985
font_01_sfnt_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 17552 bytes
SHA-256: ef3654d8ddc59ba6b3c7eda0a19933f732ea48abab2e59eb4adc37315eaf6ef4
font_02_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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