Malicious PDF — malware analysis report

Static analysis result for SHA-256 44041dce185da095…

MALICIOUS

PDF

72.7 KB Created: 2021-09-10 16:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 67b48e7f58a9814d1dc40c9e899d58de SHA-1: 4d23a23a085ce4364aaf784ff6ac58c855a990dc SHA-256: 44041dce185da095f011d0df8c3361aae2c4083b6da968c999646ba39cef7b9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL suggesting a lure for downloading 'roblox'. The presence of many links on disposable hosting further indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=roblox+download+android+1 PDF link annotation
    • https://dalilak1.com/userfiles/file/magusonoxinavofiridoxis.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/1543308334.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/votudine.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/gaxifidufu.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/88707830504.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/supipuxefigodumixanonadak.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/44813349730.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/rotifuvulavovojugizid.pdfIn PDF document text
    • http://hongdacable.com/d/files/tenabik.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/93748350330.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/bozoz.pdfIn PDF document text
    • http://innotack.com/userfiles/files/47899128496.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/tusovipojorosijikajot.pdfIn PDF document text
    • http://meskerjager.nl/media/files/85260835027.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/sipibevijemetisapo.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/1613174203.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/81464350482.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/kibewafadi.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/79167736521.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/maporilefekewawes.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/jozomo.pdfIn PDF document text
    • http://erpos.sk/data/files/wezekiminu.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/36649818637.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b1ebcb3039c746a22726d45b55fabf9c/81881994266.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_off0000bb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4A 16800 bytes
SHA-256: 23afe98998e1e5b25986ff4038a9b364e8d0c30902663e376544e0197698c073
font_01_sfnt_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 10268 bytes
SHA-256: 027bd64c6f8a2d88417937effe848379b6924f44492a64e3e18ec828e4d7bf99