Malicious PDF — malware analysis report

Static analysis result for SHA-256 abad326ccadd7c4f…

MALICIOUS

PDF

70.0 KB Created: 2021-04-01 08:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b189fcd3b282a7c61bc58fff1dee9e3e SHA-1: 4605f94c8393b6e9a3f09bb6d8f7102a8baa96bd SHA-256: abad326ccadd7c4f941749051ca7ebba08e0bcea7102a9ed27a744cac8b1899c
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains a large number of embedded external links, with heuristics indicating a 'PDF_SEO_LINK_FARM' and 'PDF_URI' firings pointing to suspicious domains. While no scripts were directly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=brightsign+xt1143+pdf
    • http://vejenov.iblogger.org/relagal.pdf
    • http://supernefritroller.xyz/lifiwivijodafozulataoax6v.pdf
    • https://cdn.sqhk.co/wopeporamo/dojgmji/london_bridge_wallpaper_4k.pdf
    • http://fastpysystem.online/shimano_claris_r2000_specsrhpbx.pdf
    • http://fexekozupupuge.22web.org/interior_decorating_jobs_salary.pdf
    • http://omoikiri.info/how_many_calories_in_chick_fil_a_southwestern_saladw5zj9.pdf
    • http://femusawar.iblogger.org/isolation_of_fungi_from_air_lab_report.pdf
    • http://selectgetc.top/psycho_book_serieslha3o.pdf
    • https://cdn.sqhk.co/bajafigotuvi/fPhhgdd/firofenoziwebapazejafijud.pdf
    • http://zisasisolawewal.22web.org/64298161070.pdf
    • http://vumajepipixoju.iblogger.org/sbi_general_insurance_agent_commission_chart.pdf
    • https://cdn.sqhk.co/sutekepape/TZghdzr/health_tip_top.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dezologukow.rf.gd/dodogososodoriredoj.pdf
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_ee21d77e9b7a4003b0d2a2cd8a9647bb.pdf?index=true
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_4d183e14e117455a9fb074d1c9729c83.pdf?index=true
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_a0f7a76d51134c579517e34dc77103a0.pdf?index=true
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_cdeede73e25e433e85259897ba8574d5.pdf?index=true
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_e3cc98bd7aee41fbbf6e2c21e000fe7f.pdf?index=true
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_580a6b0e44ef4c299c766510217aba0f.pdf?index=true
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_41c7d7bb90864ba4b856c3d5f7c2267e.pdf?index=true
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_b3f004f5fb7549bc94471b10ff5ba721.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_off0000cf20.bin
3013bffb91a6f4ca1f4965bd409e3dcfbf0c60c26ad2904991e9f276548fab48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF20 5480 bytes
font_01_sfnt_off0000e1e7.bin
8bb8581213cf7f54e512fd079603d208d58f6aed423c516817129540587627e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 11504 bytes

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