Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f6589df6f6e370…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 21:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3805f37c298ec5af49c4597c0a96b602 SHA-1: 36a4b42c3dbd81b017095e6cbcb45f76bbb5dc82 SHA-256: 25f6589df6f6e3704348de1e676d0560690a78a24eaacc7e880aa3d63976a188
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, though obfuscated, are consistent with attempts to redirect users to malicious sites.

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://madmojo.com/fckupload/file/zapejikofixepuguga.pdf
    • http://radiosalsa.fr/php/rs/filesupload/file/xufunikefigosifopakudu.pdf
    • http://oecschool.com/userfiles/file/losenisesataviju.pdf
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/51473490.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ab1cf42a856dae8266f3869e002eedd6/wudopasup.pdf
    • http://hagelkonzept.de/userfiles/file/13930660440.pdf
    • http://stellar.ru/ckfinder/userfiles/files/ziwuvudufumo.pdf
    • http://neogmbh.de/www/sites/default/files/userfiles/file/naxubokenitubifox.pdf
    • http://ccsilver.kr/files/fckeditor/file/5118373316132696367ceb.pdf
    • http://citysoupsbellevue.com/uploads/files/jinumavufedimusujujiduta.pdf
    • https://xistenze.nagydavid.com/files/files/sevakidatiwexezifokurobiz.pdf
    • http://eurolocal.info/sites/default/files/images/file/piriwaxanukuru.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/19364014694.pdf
    • https://zegaoyun.com/calisma2/files/uploads/81423680213.pdf
    • https://sealand-pptc.com/userfiles/file/nadulabokujagotolufukoz.pdf
    • http://pcserviszlin.cz/ckfinder/userfiles/files/55987393134.pdf
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/77450036324.pdf
    • http://straub-online.ch/userfiles/files/88120553454.pdf
    • http://centronegozi.com/public/20124282257.pdf
    • http://laserinnsbruck.com/static/winuzejopiluxum.pdf
    • http://www.anclupnapoli.it/userfiles/file/398028888.pdf
    • https://wojczak.pl/userfiles/file/ramuxapajaparumexubamumi.pdf
    • https://fluffy-chins.com/images/file/8078271067.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414e438f35---wesejedakuzedemifenunosa.pdf
    • http://4x4autok.hu/userfiles/files/wiwofigulozapofadisewopos.pdf
    • http://www.neoneofitou.com/ckfinder/userfiles/files/biwixixet.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=winter+funny+gif
    • 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_off0000b904.bin
066421e12cc13662360bd6cb4754b1a79c34816b6b05a36b5f07d92f98a25aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB904 10100 bytes
font_01_sfnt_off0000cfa7.bin
c7596c61026681ac75f959e676ff592604a10ed17060a0b7e6330102214ae48f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 17968 bytes
font_02_sfnt_off0000fe0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 16792 bytes

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