Malicious PDF — malware analysis report

Static analysis result for SHA-256 27eed2bb38c4136d…

MALICIOUS

PDF

67.6 KB Created: 2021-09-25 19:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02a22fc42b6c616a193a7a671e97963a SHA-1: ce46f1abf8ead53855b6a8afa0f50873d49f8bcd SHA-256: 27eed2bb38c4136d968f913cca0c162514ad8504f0a9e6cd06051fd0eb345b92
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is part of a link farm aimed at obscuring the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stopserv.ru/files/file/jijoxuduxafuxejoxapomi.pdf In PDF document text
    • http://quaretti.it/userfiles/files/raredonogizovuliwitodubi.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/5135454583.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/98018339945.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/puwajanotalububuwufawenor.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/6169763094.pdfIn PDF document text
    • http://saint-party.com/media/file/55964909713.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210911150241388.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/kofejowogatafuf.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/32252929999.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/63717304808.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/sijuvosikojevogipuvagi.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/11847968936.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/84663986094.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/gezazolurarowire.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/mozasijiliju.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/31687365098.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/suxapivinuzavazijat.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614036509aaf0---30251658935.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/1996560173.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/zazexijamujipopatiwor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=lost+island+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_off0000ac8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49F 15024 bytes
SHA-256: ff7d151bd2d96e964f1e854ef9c27d03749102acd1e0f333665e4be265fd6541
font_02_sfnt_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 10200 bytes
SHA-256: ac7a60d1df566233c7b240c2f1f5a6b98b5d7ee28d91385bcf490be38c7da831

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