Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3219eaabcdc09f8…

MALICIOUS

PDF

83.2 KB Created: 2021-02-14 14:36:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7499896b927118864cd6ef69a5c80235 SHA-1: b69bdf2d2301c11d1294e6c4515b9187314d81d1 SHA-256: b3219eaabcdc09f8da50531da3fe7bf8839bb1e7f03727ed2310770053d334c9
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it hosts a large number of external links, likely for SEO manipulation. One of the primary external links points to 'maypoin.ru', which is suspicious. While no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to potentially malicious content or a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/aws?utm_term=activity+diagram+uml+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461751/normal_5fdb366f3b2bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388280/normal_60222334ec056.pdfIn PDF document text
    • https://setibadumizokeg.weebly.com/uploads/1/3/4/8/134880372/silipunuviko_tesoxibasulawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_6015dd10dfbf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5ff3cc217e53c.pdfIn PDF document text
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/694bb2b6857c4fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5fcd6e860b346.pdfIn PDF document text
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/fdc4d4c6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_600ca3b87aa2f.pdfIn PDF document text
    • https://basopuseg.weebly.com/uploads/1/3/4/7/134703880/6344c91f2bf8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5fdcb27791764.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/vivaldi_android_adblock.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/grade_9_english_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/toilet_cleaning_schedule_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/92468109669.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/bujax.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/27942119671.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/mini_usb_to_vga_adapter_android.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/belkin_wifi_range_extender_n300_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/xawaroxegapape.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://scripts.sil.org/OFLIn 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_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 5448 bytes
SHA-256: cb2285f9b7739cf44431f6a21f25453627c270f4ae42a5f37884f39d5fef975b
font_01_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 10968 bytes
SHA-256: 4ca12867e53a06418538553c6092fcb9cfcf436d044ad50260c2894b26904567
font_02_sfnt_off00012a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9B 16180 bytes
SHA-256: 5f3764956a3f032a41c875d4264b2744e0aecdd61c74f424ef2728f57598c8c9

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