Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82b8ad93d672d52…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 06:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08e242abdbc0d345742fe2e48565be31 SHA-1: 6457efeb4810768dc52610b24c34a71fc91b4f37 SHA-256: b82b8ad93d672d52126f6567beae90bcc68f3230f79dc75717e811919039997c
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to one of the numerous external URLs found, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://catamma.ru/uplcv?utm_term=how+to+turn+off+messenger+chat+heads PDF link annotation
    • http://yasairamenbar.com/uploads/files/kosof.pdfIn PDF document text
    • http://geotersrl.it/file/bobuwoveri.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/bifigigim.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/55345570448.pdfIn PDF document text
    • http://oris-am.com/editor_up/towafinupivasup.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/72605684230.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/94694460002.pdfIn PDF document text
    • http://infunplastic.com/d/files/xufarazemofakovonomo.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/zenelako.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ruq7mu2i6nm2794q9m48shdcul/33487039776.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/63647300219.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/mivomefiwovubonosifap.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/fenatifujigunupazoden.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/nirurirexaraw.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/19196029307.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613461f1943f2---97455851560.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///67717421799.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/zazepuxokinosivi.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/pivopesururinirur.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/ziluvepirimozezemumekuwa.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/jozovuxopoxilekozaduzaxo.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/mepijewebalumeladoz.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109070416181930.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/jutawefexeka.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/bulufoxetavevutaxolun.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_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 10964 bytes
SHA-256: 8165fbd17b533e0646e343ee63f160d74aafe478c09c3e3a445262d6c2421c4e
font_01_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 17900 bytes
SHA-256: faa29afb9801459284b5fe8b5124f576018a8e51bc173ae876fde33a8da00516
font_02_sfnt_off0001236a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1