Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d5bbc4ed2c925e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 10:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85100a788a88df233889f880b873ddae SHA-1: a68fb6842665035233af7318563e63d41aac1b09 SHA-256: 81d5bbc4ed2c925e3e21f7b8cb4d6ae265ce39b5cf8c4c14e9a48e360b8d29b3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download a second-stage payload or redirect the user to a phishing site, as suggested by the numerous external URLs found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=mission+kashmir+full+movie+download+480p PDF link annotation
    • http://evaemlak.com/userfiles/file///xolalubibugo.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/varosatomojiwatef.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/25e1bdd40007f21fc43be54a9944f879/kogerugozasurubizole.pdfIn PDF document text
    • http://status.cz/UserFiles/File/46704952853.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/jabalabopobom.pdfIn PDF document text
    • https://bagstyle.uz/images/file/wimexezax.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/pojipunepopet.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/32627271384.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390fd7f22f7---ferizexanabasiripakaj.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/44752193285.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/51712379424.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/zobutarim.pdfIn PDF document text
    • http://koala-al.com/d/files/49806959958.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/sozaw.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/59522257765.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/vaboro.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/kedipomaf.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/koxogadesefef.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210908052422.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/24974060095.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/pasipajodaporewu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fakimavofo.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/36635546051.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_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 17256 bytes
SHA-256: b06f710e1949ad877db3a5c99d3de353b73ecfb56f463067e44d7502dd7eea41
font_01_sfnt_off00011117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001292e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292E 11408 bytes
SHA-256: 9f138e169ee5c8a08e3790af0afe3e36cadd4b5e3eb6012d5eec9db0f887603e