Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bb957d14b7c240…

MALICIOUS

PDF

79.1 KB Created: 2021-02-26 22:08:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7c53fe6a0d504c771b453014beff8425 SHA-1: cca8d99c11304e0d3c1130ae3f8438b87d60a46b SHA-256: c5bb957d14b7c24009b217edb476d56014d48db57027721e6a195437514d1f58
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure designed to obscure the true destination or host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=2017+fender+mustang+90 PDF link annotation
    • https://cdn.sqhk.co/safubuguva/WjcjjgN/xorimiratoxokolejud.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/hg5iegg/remevekuw.pdfIn PDF document text
    • http://reduslim-europa.site/lajagekt2ukt.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisoritet/8aOtAU3/79590603026.pdfIn PDF document text
    • http://yoga-italy.space/farojovinimobasonipov72yp.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/good_evening_in_spanish_pronunciation.pdfIn PDF document text
    • http://rineset.xyz/digimon_virtual_pet_2020_guideyssmz.pdfIn PDF document text
    • http://fuzirirofo.iblogger.org/coochin_creek_fishing_reports.pdfIn PDF document text
    • http://jitokinut.iblogger.org/bangla_vuter_boi.pdfIn PDF document text
    • https://cdn.sqhk.co/fepewujufa/vheIHjb/my_etisalat_number_details.pdfIn PDF document text
    • http://zaroramo.22web.org/epa_total_coliform_limit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nekezoxugi.rf.gd/template_for_brainstorming_meeting.pdfIn PDF document text
    • http://womawujun.atwebpages.com/36086632088.pdfIn PDF document text
    • http://dizavinizekabos.rf.gd/surah_mulk_with_english_translation_by_mishary.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/zmodo_doorbell_camera_reviews.pdfIn PDF document text
    • http://wobazopaf.epizy.com/hypersomnia_imdb_parents_guide.pdfIn PDF document text
    • http://tuxefefili.epizy.com/case_study_marketing_strategy.pdfIn PDF document text
    • http://devuzobek.rf.gd/galactic_civilizations_2_ultimate_edition_free.pdfIn PDF document text
    • http://gidepajujida.rf.gd/51149477552.pdfIn PDF document text
    • http://losaxoxajav.epizy.com/kumafavi.pdfIn PDF document text
    • http://sukidagijonola.rf.gd/belukeropajulosegowujez.pdfIn PDF document text
    • http://folilef.rf.gd/brave_frontier_colosseum_guide_2018.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 5660 bytes
SHA-256: 2fe20f98adf42ac995596eade6717f681d01a736c68707b4924ca595a836b84d
font_01_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 10988 bytes
SHA-256: 8c6daf80fb0b4f69475b3fbf617a18889bc9c5ccf2561fe33d4f38406ba86fb0

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