Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53c7de45e4c7ea0…

MALICIOUS

PDF

84.8 KB Created: 2021-03-14 15:04:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9057ab5ecd2031b0e974cca0f32fc37e SHA-1: efe6f852d2ad5d9c3112f9c0c3b09a1a7ed18293 SHA-256: b53c7de45e4c7ea08cf4c6293b7d8dec34a809493b2a7a8a3cbf05091d199886
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is part of a link farm, with a significant number of external links pointing to disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. The embedded URLs and the structure of the PDF point towards an attempt to drive traffic to a network of sites, potentially for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/wix?keyword=super+mario+bros+run+apk+hack PDF link annotation
    • http://gowanenutik.mypressonline.com/jomewokibomakenos.pdfIn PDF document text
    • https://cdn.sqhk.co/sugojipo/3esgfcY/men_s_fashion_guide_to_suits.pdfIn PDF document text
    • https://wotawodakel.weebly.com/uploads/1/3/5/3/135316359/bopejiluzofiv_surujedum_sozipagogotegin_joxobotakitepos.pdfIn PDF document text
    • https://kowevufewes.weebly.com/uploads/1/3/4/3/134388306/jedufofubokuzu_kamoge_forolugokibu_sulogoto.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/AngUiji/95354979130.pdfIn PDF document text
    • https://cdn.sqhk.co/fezavomol/hhjfzQR/67979500418.pdfIn PDF document text
    • https://cdn.sqhk.co/xewumoxu/jbbhamx/derubesimoma.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/yjeheoZ/smartwool_gloves_mens.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/a4bogeO/93196328093.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/ZigPjgg/eagles_greatest_hits_volume_2_album.pdfIn PDF document text
    • https://menafemudiwifog.weebly.com/uploads/1/3/0/8/130813668/zegokomosorurita.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/agenda_2020_para_el_desarrollo_sostenible_onu.pdfIn PDF document text
    • http://wusumomijo.medianewsonline.com/standar_nasional_akreditasi_rumah_sakit.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/fibunajowofanoxekego.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/9KjcCrD/70936285961.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/Ljjhhgh/riders_on_the_storm_piano.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/best_international_business_major_schools.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mudurixo/nodipare.pdfIn PDF document text
    • http://wovogaxix.epizy.com/fobif.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/wheat_belly_carrot_cake_recipe.pdfIn PDF document text
    • http://lanotiwigizoxep.epizy.com/oxidation_numbers_and_redox_reactions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/majogatomazabawew.pdfIn PDF document text
    • http://bisopat.rf.gd/win_10_version_1809.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/cheerleading_uniforms_for_babies.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/tidatim.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 5448 bytes
SHA-256: 6731ad932be9b2790ec555db4a6fe9df0f2b14030179351f600ce469fef4efa6
font_02_sfnt_off00011de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 11596 bytes
SHA-256: d5a2db556b8ba80beef8f7b9189683724f52a5310dce415b4a34cb0303142bf0

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