Malicious PDF — malware analysis report

Static analysis result for SHA-256 3389b36779acd56c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 21:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97625396be6ac9229802c2bb7d23f322 SHA-1: 8a43c549d8212379776ca4b719cd6c46643de5d3 SHA-256: 3389b36779acd56cb549118ad7285877ba825edffa38fb13d9d748c0a1130851
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many pointing to potentially disposable domains, indicating a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://bakersfield.thepokeluau.com/uploads/files/49380179141.pdf
    • http://rinsacars.com/files/others/2147679067.pdf
    • http://csc0516.com/userfiles/file/20210901122431_5a57i2.pdf
    • https://hsse.hssanesteban.cl/files/zijizesilimopos.pdf
    • http://wittlich-luexem.de/userfiles/file/degaxuva.pdf
    • http://tokyoto.pl/UserFiles/file/lureb.pdf
    • http://ljjxmining.com/uploadfile/file///2021090315330921.pdf
    • http://baohanhranghm.com/upload/img/files/14980570285.pdf
    • https://cryptobasics.biz/uploads/files/64205528804.pdf
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/14524239968.pdf
    • http://gimhaejazz.com/fckeditor/userfiles/image/38979599164.pdf
    • https://concertwristband.com/resimler/files/sonugeva.pdf
    • http://alumcity.ru/userfiles/file/jogaridumevelefijovekubep.pdf
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/zomuwabofa.pdf
    • http://zlhk.ru/upload_picture/file/jetek.pdf
    • http://grandviewcommunity.com/userimages/1575153314.pdf
    • http://bhartiyambeohari.in/userfiles/file/kedekozifasadavawu.pdf
    • http://www.cavice.fi/tiedostot/files/78180582866.pdf
    • https://ww150002.linebot.net/upfile/files/20210904130012.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161307e709cd9b---9496720406.pdf
    • http://mama-care.com/UserFiles/file/morelevafoxizosetava.pdf
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/difuwet.pdf
    • http://sakesushilakehavasu.com/uploads/files/xuridunex.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/papojipifat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hp+samsung+dibawah+1jutaan
    • 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_off0000def8.bin
93e99c0e21f09604fba7f36aa5b552601154ba35402ebe40ec48c729e5cb939d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 10940 bytes
font_01_sfnt_off0000f7ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 16792 bytes
font_02_sfnt_off00010fbe.bin
80c3072b1218cf852ac903f8c9fb63032daf23b4d3435f975661070d3480c9ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 17272 bytes

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