Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40d0a9d85acf2a2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 11:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08d9a0036d4da20c42c6dd34e5f198b4 SHA-1: 1f62d7eadcb8e6639cc78fbbb2fba599d22328b5 SHA-256: a40d0a9d85acf2a2154500beb52e03d6fab90050ceba3956bdb784963785c93f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pq89dspfjfb5shr3j9mupgbfe3/26012434944.pdf In PDF document text
    • http://sprinter-lab.ru/content/File/sowupolik.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/dejifezas.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/33543988401.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/dinapazif.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/morigetupoxetitututilu.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/13072067969.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/lugikoboxisokut.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd0037c6b---pozukiguwaro.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/dikadafanad.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/gusowajokufupajifula.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16304751929JW9.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/76046401728.pdfIn PDF document text
    • http://darec.sk/files/files/45715047159.pdfIn PDF document text
    • http://belean.pl/userfiles/file/jolevu.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/xoxad.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/88877320030.pdfIn PDF document text
    • https://davaocarrental.com/images/file/92278622494.pdfIn PDF document text
    • http://markone-tools.com/upload/files/zemolurepegopawisinaro.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/wevizujikebixasuzuguduxa.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/90008848295.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630815024.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/vidikolulimirozolokixem.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/10301545942.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/67195104722.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/visibuzewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mobile+to+chromecastPDF link annotation
    • 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_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 18008 bytes
SHA-256: 0b44d75791c1988d7913563de5c1fbe9a9a7bf7f2885c092ec59587a74e3e939
font_01_sfnt_off00010bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 10524 bytes
SHA-256: 7dbfb8cce8790d17ec4e83b6406b8c77f7189f881a2ad114c1f5a09c3d9af642