Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9b8fd520c5f9fa…

MALICIOUS

PDF

79.0 KB Created: 2021-03-09 21:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2af8feb579d80e378d938e80ad4a826 SHA-1: ebac3e1528a44b7dc4c3489be28cb5d31a9bd173 SHA-256: 2c9b8fd520c5f9fadba8eac3425defadec631bf05acc9a88b4d596ce4040bbeb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings, a common tactic for phishing or malware distribution sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=atwood+on+demand+water+heater+service+manual
    • http://helpcopyright-service.com/thanksgiving_math_worksheets_8th_grade7u5tx.pdf
    • http://morj.space/bozemesebuxagxv.pdf
    • http://itdiscount.info/libertango_free_sheet_music_accordionmdbn8.pdf
    • http://italonewsero.site/grammaire_progressive_du_francais_-_debutant_complet_-_corrigeslm0pb.pdf
    • http://fineagencyy.com/29800431168jk9a4.pdf
    • http://mugedly.xyz/casio_world_time_illuminator_watch_review6qt4u.pdf
    • http://static-start.top/3535138994kz1u7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_0ab388794e9342779f8600e521378d2b.pdf?index=true
    • https://81d89a68-18ac-4cf1-ad00-ddd5d2f7da41.filesusr.com/ugd/ed58ef_714b06ef371b49739ac0d3942575c810.pdf?index=true
    • https://s3.amazonaws.com/devuxuzejozam/spoken_english_through_tamil_file.pdf
    • https://97b366c7-6e8f-479a-b18e-582a09c04a3e.filesusr.com/ugd/78c764_f3777aad96fc48fcb1d52daf34056b90.pdf?index=true
    • https://s3.amazonaws.com/fefurorobumi/48323944887.pdf
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_44c0258b02d5423c96a0e25a408f1580.pdf?index=true
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_da9462362262463ea1a3a68b59fa4ce7.pdf?index=true
    • https://s3.amazonaws.com/tuxutedi/warm_bodies_full_movie_dual_audio.pdf
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_05c14cca9d6d4bd3a2b89492571c6e31.pdf?index=true
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_e8e63d6c245f42bf8910bf6278ddf33b.pdf?index=true
    • https://s3.amazonaws.com/silubebebefuju/psychology_noun.pdf
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_1f6ad48c122f49b1b04b3a3be1827a46.pdf?index=true
    • https://s3.amazonaws.com/putelekireza/nupimetilafubalutipujusa.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_off0000f547.bin
6b2d0c11208c06ed7998e467af301e707df7015b912e29366dc897481b3bb5fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 5320 bytes
font_01_sfnt_off00010747.bin
574a45ddc0466cf95f4480313d909d3cf76f09fc0acd3d405bbbc5a963c8423c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 11540 bytes

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