Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef12a25bbe2e9fa4…

MALICIOUS

PDF

76.7 KB Created: 2021-02-16 13:27:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5ca2af1490c96f89778e7516b495cde3 SHA-1: 9e1e0d4e2bd968c33f92e3fcf9e38052750f9a2b SHA-256: ef12a25bbe2e9fa4c990d368e35816955e97e711ded69b22a551828205d35478
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 0.9997

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://baarspo.ru/wix?keyword=husky+tools+warranty PDF link annotation
    • http://mijudivoxobo.iblogger.org/kowomo.pdfIn PDF document text
    • https://wijununag.weebly.com/uploads/1/3/1/4/131438003/5e286e227e6.pdfIn PDF document text
    • https://fupefomaxoxaje.weebly.com/uploads/1/3/4/8/134897629/wekufoxowefowonigime.pdfIn PDF document text
    • https://vopupina.weebly.com/uploads/1/3/1/0/131070761/vatisibe.pdfIn PDF document text
    • https://sejoxamopizava.weebly.com/uploads/1/3/1/8/131858661/317028.pdfIn PDF document text
    • https://lemuvizavo.weebly.com/uploads/1/3/2/6/132682731/f4d9d74dead929.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/650c7cd3e3f3ce2.pdfIn PDF document text
    • https://nebemono.weebly.com/uploads/1/3/4/3/134331812/149bd70c86.pdfIn PDF document text
    • http://goossyy.online/supercars_for_sale_texasrlhc4.pdfIn PDF document text
    • https://bigikudas.weebly.com/uploads/1/3/0/7/130775628/075ea2ffd0cb.pdfIn PDF document text
    • http://buytoday.cc/60052211005iasx.pdfIn PDF document text
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/1381838.pdfIn PDF document text
    • https://xixirebuwujesi.weebly.com/uploads/1/3/5/9/135989839/bexini.pdfIn PDF document text
    • http://hotita.fun/chaka_khan_ain_t_nobodyqmnhb.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/how_much_does_it_cost_to_install_a_gas_water_heater_from_lowes.pdfIn PDF document text
    • http://verekozugotised.22web.org/82130848708.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zinudipir/conjunction_agreement_form.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/playstation_2_games_for_android_emulator.pdfIn PDF document text
    • http://kifofok.epizy.com/18831492487.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/46227589661.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 4616 bytes
SHA-256: 51dbdb42089b1616d2c8a068d294bf4c1953949e6669cbeb29253879e7322e73
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 9932 bytes
SHA-256: c00553088db33ba43a5704135354b1e3b0ab65623982c8713ddc6e5a287f46d3
font_02_sfnt_off000117a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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