Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d70c04fc90f461…

MALICIOUS

PDF

154.5 KB Created: 2021-09-15 12:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20f5551efc8842aa4338fc0b19e9af48 SHA-1: fea66da61651ede08659ce025f385306c1e1c211 SHA-256: 11d70c04fc90f4618129c9e62ec797d6a5cd00545b408650f3cb66053d741d9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 https://fiscalonline.eu/app/webroot/files/userfiles/files/mefala.pdf
    • http://xutricolor.com/uploadfile/files/jakubofu.pdf
    • http://affectif.ro/data/Image/file/26566696511.pdf
    • http://ciaomamma.hu/editor_up/31231399454.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebf58e5970---zepofadixujofofatokisavor.pdf
    • http://gamax-motor.cz/data/dokumenty/pazowikuziwimavimoxupus.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/voxadetegos.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qskudq6sdkg4aun0al9lb9ndt3/kobomusikudu.pdf
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wapivezinafilosegijif.pdf
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905142359182407.pdf
    • http://www.smpnuenen.nl/images/files/woxamezevuxavag.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/kefirupaxufaxowuba.pdf
    • http://jayeonrak.com/upfile_editor/2021/files/dovofatuzasidetele.pdf
    • http://autohondl.cz/userfiles/file/guredominajuxibetisu.pdf
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/jixiz.pdf
    • http://lamekatus.com/uploads/ckeditor/files/19471147155.pdf
    • http://fisioterapiasuzzara.it/userfiles/files/vatevuzugu.pdf
    • http://julianowka.pl/ckfinder/userfiles/files/zodimevarebazerukekujugo.pdf
    • http://mindennapi.hu/upload/file/zewijide.pdf
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tugikawinibugixuzamop.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/dogirujosiwida.pdf
    • http://datavincity.com/uploads/ckfinder/files/zavasixejesasa.pdf
    • http://unitekinfostructures.com/userfiles/file/puzuvagadagusebikilodubu.pdf
    • http://good163.cn/Uploadfiles/files/10037590209.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=6+letter+words+starting+with+po
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d1ce.bin
4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1CE 16104 bytes
font_01_sfnt_off0001e71a.bin
cbdefcf337904cea1cf65af9367f129031fc1328c0c712c12e28ab06b77dc13f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E71A 10828 bytes
font_02_sfnt_off0001ffdb.bin
4c94aa738a6ed077b93180933746a105e51c633bf1fc523204ed0f531a118c68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFDB 26716 bytes
font_03_sfnt_off000242d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x242D7 16792 bytes

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