Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3c30b5d7222e22…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 09:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8f96c6e365904b5fa0a6ed46e9982bb SHA-1: 7df14356a0f7fc89f0fd2339ac253b67f15b7685 SHA-256: bf3c30b5d7222e2223add00ce9b4d06a0bb2906b9977d0243bca2287e60ab9c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=one+one+vpn+apk PDF link annotation
    • http://jdjcnc.com/upfolder/e/files/20210911195714.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/kivubotafamepefum.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/larak.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/83740354275.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/bibimitotajugawimagimaro.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/xupojerovorawaf.pdfIn PDF document text
    • http://marketingnews.fr/images/file/zagedivenukewov.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/58943523550.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-16/20210916050143136297.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/58711140294.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/vanagigoluwebosugiruxol.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/89742803219.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/j9t14i504vaonqpjj6m6kddg27/kodetipin.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sidojavomogu.pdfIn PDF document text
    • http://climtech.com/files/files/92344141737.pdfIn PDF document text
    • http://poultech.net/d/files/73428897116.pdfIn PDF document text
    • https://intersat.lv/files/file/xovupilepiku.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210903001957_nmkk01.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/80077489710.pdfIn PDF document text
    • http://www.siposferenc.hu/html/22913103487.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e1ae2840558fcb24fbf6c59f70e358fb/20372609285.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/nagatikukitutixovusurat.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/mafopuwofefamujosijep.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_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 9924 bytes
SHA-256: ccd8540a177407c20bb1293800a3f95c804c359e97faa62741c389ea5d8a979f
font_01_sfnt_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 18228 bytes
SHA-256: 83a20186b6f273ad297e1a14f5e7eb9a7a63500abddc15dbbfa0e2c9528d2a67
font_02_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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