Malicious PDF — malware analysis report

Static analysis result for SHA-256 86987912c144e804…

MALICIOUS

PDF

78.1 KB Created: 2021-09-15 14:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3dd2bbfc76bd8aec1b00cd9cf709c4f SHA-1: bb0ca46e06e3dea5b836ef1688186c43f687b2f2 SHA-256: 86987912c144e8048b79a0d75f3ded9dadc0386b1bd5b6a794be3691b04e1788
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=mi+11+lite+compare+redmi+note+10+pro PDF link annotation
    • http://daiduongmetal.com/uploads/ckfinder/files/71796493327.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/kusalovozejusizomijor.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/170745966161366275ccb8e.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/83143538212.pdfIn PDF document text
    • http://unsersohn.com/images/file/39874560658.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/lejafagogelabisix.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/68034065292.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/13723421690.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210912204651.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/33830701557.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161348ec7c9368---46749503822.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/pinutivebijomumixotasog.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/sofogajuji.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/nomavefolupazozujinitiko.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/62024554450.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8b53af09f3f7ac360ae02979e788dd15/16956955808.pdfIn PDF document text
    • https://airbays.com/userfiles/file/tenovow.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/89498387716.pdfIn PDF document text
    • http://thegioioto.store/upload/files/soruvexidafenani.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/berorafi.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/jajuvexegovito.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/tuwosokozuwoboser.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/39775058290.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/wenubujinolexibikejumutu.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_off0000ce75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 17080 bytes
SHA-256: d9766bf6c8efb17ccaea3c85d9f585d0b3726f9e3ee190022dc08e89be5a62f1
font_01_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 10672 bytes
SHA-256: 2b3b2748f169765da4f8cf02f4da199e0cfb89c0896c01ae10a4b87fa5aa7544

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