Malicious PDF — malware analysis report

Static analysis result for SHA-256 a977b4d28bcda3c9…

MALICIOUS

PDF

79.8 KB Created: 2021-02-08 09:23:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7a5deee09d3c79543483441d0c1e0f4f SHA-1: 30690f775d368fcd8a473366831a0d0da223b36c SHA-256: a977b4d28bcda3c9b05ac06878f0dc8fc58ed9770e59c526f2110c29ae6692a2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF_URI heuristic suggests an attempt to redirect users to external sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=send+email+html+form+using+javascript PDF link annotation
    • https://cdn.sqhk.co/nezupusovefi/iiijEia/rufon.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/djbihrb/social_intelligence_definition_psychology.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/fih3VNj/xobememuweso.pdfIn PDF document text
    • https://cdn.sqhk.co/nofatazor/faaFhdj/kogux.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/geUgil1/2833003906.pdfIn PDF document text
    • http://armada.technology/biography_of_narendra_modi_bookx3gaz.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/akjhEjc/33947428777.pdfIn PDF document text
    • http://mklhhhh.space/limiting_factors_affecting_photosynthesis_worksheet_answersgzzf9.pdfIn PDF document text
    • http://bubuwem.iblogger.org/how_to_add_gridlines_to_excel_spreadsheet.pdfIn PDF document text
    • http://fullhp.info/advanced_hook_gta_5grob6.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/yeicFMW/airtel_online_recharge_postpaid_internet_pack.pdfIn PDF document text
    • http://ejqy.com/523385699247hjhc.pdfIn PDF document text
    • http://1ux.site/94158810871lefl9.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
    • http://mivuturirem.rf.gd/asfixia_perinatal_definicion.pdfIn PDF document text
    • http://larisakexifa.epizy.com/vaneluvixijononulefaj.pdfIn PDF document text
    • http://natexekazedap.epizy.com/tarzan_animated_movie_2013.pdfIn PDF document text
    • http://renureva.epizy.com/offline_dictionary_for_my_laptop.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_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 5692 bytes
SHA-256: aa18a2a4c6cbd850ca15dcba281d6c6a041de3be49364a51bd5d88fae1c8cee5
font_01_sfnt_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 15396 bytes
SHA-256: a72da65bf92550daee4ba42f5847dc46896bef62d93b80590df28fafc963c0e9
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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