Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a5cc0c45ccfa47…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 21:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df271110d4187a631ca95f1b17969c10 SHA-1: 7537c8e098be807394e09647b1a9c3e35deff8d8 SHA-256: 74a5cc0c45ccfa472f5ec87cf293a987db39e29875be90e169ea05fe673e65c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://chcial.ru/uplcv?utm_term=double+app+pro+apk PDF link annotation
    • https://by-express.com/upfiles/editor/files/52473332325.pdfIn PDF document text
    • https://successalpha.team/upload/files/walajegijifadezid.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/vimoxekiwarubitupage.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/zugaxaromubixuki.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/zemasotapadafosaki.pdfIn PDF document text
    • http://bresky.cz/res/file/kikuwusuvegebaxuzit.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/4883007999.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/nivowogapivimamoge.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/wefizak.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/famedevifixozupesowuwa.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff61fae163---87094091764.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ffbd9884---76591535150.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/xexuja.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/95690229243.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/giwuje.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/181125053661353a715bf17.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/tiwexibogikevubomopip.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/nazaxodedezokole.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/11072766721.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/zitozasetalame.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/kopovolezogabavomejoso.pdfIn PDF document text
    • http://someteme.com/archivos/_20210915215855.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/23165617497.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/supelogodifuk.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/dapemof.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_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 10116 bytes
SHA-256: 9c5b8f72cc5a89dd6b792b28bfa82f79033794c09e8bf1228b613be3325bb3a9
font_02_sfnt_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 16232 bytes
SHA-256: 2d67f47a7eb3540c757a5e8617a03d7ae88fdd77096a33e41f9cb2bf987a45c1

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