Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0f6803aaf5a6e9…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 17:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2ace593ae2433bad33e0b6c9223290af SHA-1: 15eb6e4e2b00a38c891c7be31f93f96c5d3a9f94 SHA-256: 6d0f6803aaf5a6e9e40c38138dd7e1f87d2b435009aeee880645043566e1ec70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=fs+19+hack+apk+download PDF link annotation
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/34226494464.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/38329556742.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3aed5079d---73268008634.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/pajovijukuzimukutiboleb.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/38039692216.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/35060839837.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/48798216303.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/manewilinir.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/82907619993.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/667473675.pdfIn PDF document text
    • https://eslms.com/userfiles/file/jizesojibesobofifopab.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/lepizelakunabopusonifepo.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/67076122694.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/zimudisa.pdfIn PDF document text
    • http://fabtur.ru/upload/files/40679158834.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/dirosu.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/nupuvesemojasibewuxemise.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/11319314895.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/nunozedugunatasovewomoxa.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/towalafuzudujozuzo.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/95868080628.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/56805814881.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/nudamugejamubiwukuvasis.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/misafexumenanasose.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/parudademizagojesovuxoxug.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_off0000c040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 10564 bytes
SHA-256: 4261a6df284026bf532b8c95aadff91775727eb92b350c9c55ba8fbf4fe239d2
font_02_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 16952 bytes
SHA-256: f57d7fd15507716e034fb1e4bd37aa4f2905a6454ea29c18d7b478223852119b

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