Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58966f39dbbc3c0…

MALICIOUS

PDF

71.0 KB Created: 2021-02-18 05:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00ddfe575c6ff441ac6e2912144a5133 SHA-1: 813285bed1e5e9c01568565d1c6fc92dc2c9b380 SHA-256: a58966f39dbbc3c01832f899ff7002b61cf454ec76c2aa4d54d969dd7d9ecbcb
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link to known malicious redirector infrastructure. The embedded URLs point to domains associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier output strongly indicate malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=daria+is+it+college+yet+123movies In PDF document text
    • http://fokikizuxijem.iblogger.org/livre_guide_du_routard_core_du_sud.pdfIn PDF document text
    • http://detonic-ordina.website/blue_cross_blue_shield_mi_appeal_form9sr5f.pdfIn PDF document text
    • http://fortuneo.biz/bumper_cars_on_ice_ocean_nj53vlc.pdfIn PDF document text
    • http://abwaab.su/lodibupn0mun.pdfIn PDF document text
    • https://kezuvuxir.weebly.com/uploads/1/3/2/8/132814306/ragezaf.pdfIn PDF document text
    • http://uabiomanix.xyz/41008678995wu25w.pdfIn PDF document text
    • http://tomandbxof.site/dell_optiplex_3010_tower_i5-3470jatiz.pdfIn PDF document text
    • http://winoraama.website/lemubesjyu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://telebil.rf.gd/25303202757.pdfIn PDF document text
    • http://dikokek.epizy.com/shadi_song_hd_video.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/isotopic_abundance_practice_problems_answer_key.pdfIn PDF document text
    • http://welidigukiru.epizy.com/52344175191.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/dynamics_crm_365_online_licensing_guide.pdfIn PDF document text
    • http://jilemizofi.epizy.com/solepopetegoxotumimupofak.pdfIn PDF document text
    • http://koriwiginajefet.epizy.com/polyvine_decorators_varnish_data_sheet.pdfIn PDF document text
    • http://pepebejawu.epizy.com/honeywell_th5110d1022_digital_thermostat.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/west_of_loathing_complete_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/73553437912.pdfIn PDF document text
    • http://vuvuvemalazot.epizy.com/rowone.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_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 5628 bytes
SHA-256: 7bd79ebf72050a6032d23d42cdf434c88ba2ce8d3bbabd1b1ffdb301ceda4110
font_01_sfnt_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 10236 bytes
SHA-256: d56cac8c3c168a29206fa6d6c53e647f6a92ca672edbe8f888e67408a396e469

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