Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc3721b7179b808…

MALICIOUS

PDF

86.2 KB Created: 2021-09-08 13:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 21d622d022df73dcb7b8088946101298 SHA-1: 5e99a15a86ee5c0fa374dacb93edd950b7aa9048 SHA-256: 6dc3721b7179b8087c8e975b465bd5774c7e3dfee5dd312c5fdcdd96836d74a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=genoma+humano+pdf+2016 PDF link annotation
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/72119120293.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/13795536663.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/jibopulogezuxoteperuselo.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/soluxalonepafudosuxajipo.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wukepawolun.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/rivopobomutebu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc4a1db53---sejifusamepeponanujumul.pdfIn PDF document text
    • http://herve-coiffure.ci/files/zopexurinabekamepowamuka.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/92111099988.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/vojibogaduj.pdfIn PDF document text
    • http://koala-al.com/d/files/tatavuvibis.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/6677472763.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/36215362449.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/bisiredejam.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/76795565269.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/xozulomikukivexagakorenef.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/34335283253.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/66381264414.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/kowagovabunatapet.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/64194448204.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/najeza.pdfIn PDF document text
    • https://equinox-e.com/upload/files/zolobebusawobufewu.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_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 10860 bytes
SHA-256: 45a9d8a25972ce0ce2c3944bef709ea2ca8dfcba042974c08504fde99b734ed6
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001198e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 18624 bytes
SHA-256: c2abb68599554138437a1dd683242a99342b6863fa364d53816e6ca10e144e3b

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