Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0e839809fe0e9f…

MALICIOUS

PDF

71.7 KB Created: 2021-03-28 12:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6815bfeac8befff94873a98b559c8874 SHA-1: 268b57fed9e13e7293ae1caaf4e0ddb3e12f7176 SHA-256: bc0e839809fe0e9fc304da6148da66eb53c0dd06d5f1de153cbf0c751676e8e0
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, suggesting a link farm or SEO spamming operation. The primary URL, 'https://xajibur.ru/wix?keyword=infiniti+fx35+manual+2006', is presented as a manual, likely to attract clicks. While no scripts were directly extracted, the PDF structure and extensive linking are indicative of malicious intent, possibly to redirect users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=infiniti+fx35+manual+2006
    • https://cdn.sqhk.co/tuturuno/LgcAKJz/dosofevusedivorelepaxo.pdf
    • https://cdn.sqhk.co/tipadasa/ghgq0Hl/31229197652.pdf
    • https://cdn.sqhk.co/nibedogoxov/hfegeih/popular_hashtags_for_promotion.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_5e8b4071f91146c787958216ca9386e8.pdf?index=true
    • https://s3.amazonaws.com/jutenojamega/96527246631.pdf
    • https://s3.amazonaws.com/dusined/54160704176.pdf
    • http://gevalej.epizy.com/dorigivod.pdf
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_95180fee59f04c49be7d9c4f31d53e6e.pdf?index=true
    • https://s3.amazonaws.com/tabobujimo/sekiro_ending_guide_no_spoilers.pdf
    • http://susodiwur.epizy.com/98755843743.pdf
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_eddfd2086371481c9c2272248fe2b5d6.pdf?index=true
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_af51ce8d4c8045f5b0576596b791888d.pdf?index=true
    • https://s3.amazonaws.com/pajukovuxetu/barron_s_sat_2019.pdf
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_8dad6eca9b3a4eab99395e985977f01a.pdf?index=true
    • https://s3.amazonaws.com/pevuwarobuvowa/15089393937.pdf
    • https://s3.amazonaws.com/dubiditiginowo/what_is_the_theme_of_the_story_the_last_leaf_brainly.pdf
    • https://s3.amazonaws.com/fadadedezeker/12400071389.pdf
    • https://s3.amazonaws.com/dukajevo/austerity_definition.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db25.bin
d7c20c4157ddfc7a862115f2a0f2c1729e28749183ae7bc2b72e59925b96e420
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 5360 bytes
font_01_sfnt_off0000ed5d.bin
6e5d7f0ba2b91664947b56f6c81b1e60a0e6485597663e9b6b66401d45ce2047
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 10808 bytes