Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be95bfc8857d798…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 16:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff12262d23ee2fa70268dbeadd498d26 SHA-1: c432563c28cfc38faaacda95829affcbb2500d8e SHA-256: 8be95bfc8857d79813b3e126eef0306a19252a1a27501945571285cabbe4a608
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, pointing towards a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to malicious URLs, such as the one found in the PDF_URI heuristic, 'https://allytemp.ru/uplcv?utm_term=fast+%26+furious+9+online+free'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://allytemp.ru/uplcv?utm_term=fast+%26+furious+9+online+free PDF link annotation
    • https://servingltda.com/userfiles/file/20671259995.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/74918384636.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/61560830266.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/58217084354.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/mavanepurodisapame.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210905174548.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/piwovizidojebunal.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/sejebiwavojaxemobumonunu.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/41927306470.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/40912007186.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/balevopijerefa.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/jugenufapi.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/9797274280.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/rarupusawumixaniwugu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/f6uuvf9uenosnbr56vmi67haqu/51390690922.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/jutivizojafe.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/22094308961.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/355991154.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/88197952864.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/rijorerodezoxakusukifav.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/gubowejawexuzuj.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/63619010625.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/kisidimagixilaw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_02_sfnt_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 20708 bytes
SHA-256: 668c805d59dd54f8392e82b2259d4173f1970737529feaebdc3a0fd1e2a8988e
font_03_sfnt_off0001213b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 9476 bytes
SHA-256: f51d5d1ed6f87b52d1b9f429dd51402bf3eddb0f0727a485d5a13d2cfa109c79