Malicious PDF — malware analysis report

Static analysis result for SHA-256 deda149c2cfe1894…

MALICIOUS

PDF

72.7 KB Created: 2021-04-03 15:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3ae314ab83b335f0af934730bf16d432 SHA-1: 58fb55d9675c9ce5fa2bc3dd5b248bf37b30fc35 SHA-256: deda149c2cfe18948b6ffe34497d27f0d3e036797e1e6e3154f79c9cb77a514e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/award?keyword=sheila+sherlock+diseases+of+the+liver+and+biliary+system+pdf PDF link annotation
    • https://dazifonawifebi.weebly.com/uploads/1/3/4/7/134763946/guxefuvovifav.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/hjijdia/color_code_chart_resistor.pdfIn PDF document text
    • https://vudujetejagug.weebly.com/uploads/1/3/4/6/134674723/3777201.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/ghfjagd/jumexad.pdfIn PDF document text
    • http://tesopinafap.22web.org/bojumitoxitutakivawaraluf.pdfIn PDF document text
    • http://vumujedoziwuku.22web.org/65912210516.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/dheGL5w/66297323188.pdfIn PDF document text
    • https://cdn.sqhk.co/puzokopu/jeCihWK/kogama_adopt_me_pets.pdfIn PDF document text
    • https://cdn.sqhk.co/sururezog/w4Cj0ii/eventide_2_sorcerer_s_mirror_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/volumusigu/gczYUNi/36597879139.pdfIn PDF document text
    • https://fesomexipilajuj.weebly.com/uploads/1/3/3/9/133997099/wobeg.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/EJgfVie/nick_cordero_gofundme.pdfIn PDF document text
    • https://cdn.sqhk.co/viliwogid/jwmi3jh/vopegawegibejogopir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c4647614-9ff8-4b00-b819-08dc938bd166.filesusr.com/ugd/5d3f24_a586e9151cd8464399ab010c4170c790.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonebon/aadhar_card_form_marathi.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_12539e6fb116416ebcb2c10a0be6d19e.pdf?index=trueIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_dd256afb241c485dafa80523efe97714.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/junibesenamotovotis.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_363c3d763ce14034b6a78863c70be296.pdf?index=trueIn PDF document text
    • http://susejukeb.epizy.com/41769229103.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/jenigiko.pdfIn PDF document text
    • https://medlineplus.gov/liverdiseases.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 5864 bytes
SHA-256: a89c715f71ef092d30fb02b0e797dff90c047cacb5ec8d17aaa75f9870432391
font_01_sfnt_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 10852 bytes
SHA-256: c46d4d9fc0628a715668ce5ba4cd4d9fa92817cb6eedb612d185027d06325b8c

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