Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc54986a4ed43685…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 06:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb6cfdad8342adc8b0fa8d0de04ee395 SHA-1: ae66e2199d07c2afd8565a2a575c69b95bd81587 SHA-256: fc54986a4ed436856abcff0f385dbb85f99907702c420314010e6b42bd088359
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 or trojan variant. It contains numerous embedded URLs, with one prominent URL suggesting a lure for downloading an 'ms excel app'. The presence of these links and the nature of the heuristics indicate a phishing attempt designed to trick users into downloading malware. No scripts were extracted, but the overall structure and heuristics point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=ms+excel+app+download+for+android PDF link annotation
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210904081029.pdfIn PDF document text
    • https://magatek.com/documents/file/56312827565.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021918844161182.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/lenivetivulufoxanuz.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/17083640722.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/4492636625.pdfIn PDF document text
    • http://www.perlodrink.com/documents/12504116998.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/gizelebaborudakatu.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/galopuwupobevonaf.pdfIn PDF document text
    • http://mastervin.ru/files/file/gewududetomagiwoserodas.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/tilifenawupapudagulur.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/jijobebiv.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/97055801028.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/pagekefonidofugovep.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/zexagozan.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/73400436166.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/fatimulabat.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/sofivadumavamuda.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/73680001679.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/91544441281.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/49325470210.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/36777685691.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/98194671437.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/25754711311.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_off0000af3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 16308 bytes
SHA-256: eafb40b9dfb965e6583f118cc15c85573f1e63a10e7e9d62e4e6026776bacf6d
font_02_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 10696 bytes
SHA-256: ac9d066c7371b0e0faf1589645269b71403f77ca29259377e4704d2cbcc11fbd

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