Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a6815b64c27eaa…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 00:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9fff9b3519bd80ba1170819cd46bd09a SHA-1: 558cb1fe23aebd06ae8ed333df47618d9f380f95 SHA-256: b0a6815b64c27eaaf676c1860a657ee05c01aa1c59648a6e05aa4709ad264381
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable domains. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://ketchas.ru/uplcv?utm_term=bloquer+pub+internet+android PDF link annotation
    • http://anoh.net/pds/userfiles/files/fedalafotezu.pdfIn PDF document text
    • http://praguetransfer.com/files/file/1156222278.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/tujalogurezowenalafe.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e514e9d0b---65922396260.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/kitozegujidaz.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/difufado.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/tumorivevosuranavim.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/jazak.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/65453668043.pdfIn PDF document text
    • http://paliukenas.lt/i/File/84068031087.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/99723338900.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/33541030643.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/joraketapo.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210914200503.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/63687148067.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/japofawazetupo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161478661e9034---33912649549.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/wepovegebolew.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613928cd5aa5b---fesavi.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/1111632335.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/59548354226.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/silunot.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/49370847963.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210908/210908013729704994jrmhox8auxps.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_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 18268 bytes
SHA-256: d780320d72fad4d66a0a441f2cf8562eff1f3fedb7f29dca3b7dc532bec51290
font_01_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 10656 bytes
SHA-256: 0a09c0026fd39617612c5ba525d5aaf5e751e5c0e6aaca72ee24a1f67d9e5c88
font_02_sfnt_off00011943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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