Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ffcc9e5bccf5d8…

MALICIOUS

PDF

81.4 KB Created: 2021-03-25 04:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f490c06bd3f32161b949cf3ae446144 SHA-1: bf996e9d841e71fcde58d1a936e1fe7524853f2c SHA-256: a3ffcc9e5bccf5d8a5308c480082d9b28008e3661ce9582121aae56bd4f5c9f9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to S3 buckets, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://botokaw.ru/wix?keyword=electrostatic+vocabulary+worksheet+answers', is flagged as unknown reputation and is likely the primary malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://botokaw.ru/wix?keyword=electrostatic+vocabulary+worksheet+answers
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/2468887.pdf
    • https://cdn.sqhk.co/mibemofega/jchdrhs/amazing_color_fill_3d_how_many_levels.pdf
    • https://cdn.sqhk.co/puwukuwos/ehfgfKn/jw_library_update_2020_download_for_pc.pdf
    • https://cdn.sqhk.co/gavonenegave/cpiijes/86613401735.pdf
    • https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/ddf285dc1c42.pdf
    • https://cdn.sqhk.co/pajubopolak/hif7jb8/christian_songs_about_hopelessness.pdf
    • https://damobupakul.weebly.com/uploads/1/3/1/4/131453350/55a6395f.pdf
    • https://cdn.sqhk.co/jotepomi/Hbwvido/myair_app_reviews.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nagev/hodder_plus_gcse_maths_answers.pdf
    • https://s3.amazonaws.com/bitajemisajoz/the_aeneid_sparknotes_book_1.pdf
    • https://s3.amazonaws.com/zarusegibitumet/kcet_2016_question_paper.pdf
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_caebc20f6bcd4bb29377f056ffef3aa2.pdf?index=true
    • https://s3.amazonaws.com/zuwosil/96952440776.pdf
    • https://s3.amazonaws.com/gafedupeba/35734918321.pdf
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_72076154ed0f4019ac7797b31720e19f.pdf?index=true
    • https://s3.amazonaws.com/zemigiduwagafu/sodenanuvefunegusowotawer.pdf
    • https://s3.amazonaws.com/nazekisigiduz/98542834994.pdf
    • https://s3.amazonaws.com/sugowubuf/16996441448.pdf
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_f2dd4a1d19324515be67670c1d657a9d.pdf?index=true
    • https://s3.amazonaws.com/rurovikejigibu/gepukowevonukureguw.pdf
    • https://s3.amazonaws.com/mejobu/19032466907.pdf
    • https://f766a7e9-a0d0-4e3a-bf7c-946d2e8c2ff4.filesusr.com/ugd/bddb96_e5f148772fe349699010c7587008f9af.pdf?index=true
    • https://s3.amazonaws.com/betefowubevat/remanedovewodekoxivi.pdf
    • https://s3.amazonaws.com/jaxesabi/pudozavedurigamize.pdf
    • https://s3.amazonaws.com/donukadizolin/59724435536.pdf
    • https://s3.amazonaws.com/tufitijinexu/congenital_syphilis_guidelines_uk.pdf
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_aa009e0614df41b8b1dac595e8cdf789.pdf?index=true
    • 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_off000100e7.bin
ef92b417c5adab2f226fb00c6baf7044a339735af9680e81f203394877ca7038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 5300 bytes
font_01_sfnt_off00011307.bin
b0d477574fc4770e03fe3b61a5416e7c3c9e1bdd1c4d7000c23c1d21c4663d98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 10784 bytes

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