Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc6369f1cc076e1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 23:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6f3c3ecf741e926bb9c739bf05e76b9 SHA-1: 39f0950ca0b6bcb62b217d17cd94532b22ecd2cd SHA-256: 9bc6369f1cc076e1827bdab91f1d7d86a10baf7e41b964788296f2581178be2b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to host malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pistant.ru/uplcv?utm_term=watch+the+monday+night+wars+online+free PDF link annotation
    • http://de.ruben.pl/ckfinder/userfiles/files/farelola.pdfIn PDF document text
    • http://ciskmv.com/css/file/97392214155.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/domita.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/puwuj.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/mekabarugekigi.pdfIn PDF document text
    • http://byecook.com/ckupload/files/gedub.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/43167918059.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/4687830711.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/93612533027.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/zifoxoviwisixemepif.pdfIn PDF document text
    • https://aneri12.cz/res/file/lujireboki.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/gosexizoxope.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/xarif.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210906074706938.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/87774027847.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/tokuweroguzozaboviden.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/lavok.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/musojesowifizisiwi.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/31680241769.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae27184c7---xatonimavegepobebilike.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/43039745536.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1bdd792c94eb303505d1cfe324341b1c/wiketugunop.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/lutemomofazavavatu.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/zetusotosakemavitiwib.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/6490154301.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/24249156455.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/gegese.pdfIn PDF document text
    • 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_off0000df93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF93 17424 bytes
SHA-256: fb1b7b9f0354d3d1e573e8a7a07d9d0c8885476f3a4a0f5d8023c80d42acbabc
font_01_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 11116 bytes
SHA-256: 98347b07f76c47e506c9b3faa117b47ecf79f775aed57910ad1b4e0bc34481c5
font_02_sfnt_off00012630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1