Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c15b827c202762…

MALICIOUS

PDF

68.7 KB Created: 2021-03-16 21:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4ad2ece00274b668fcac55eab8f22d02 SHA-1: b83ef039fd30f62d7e798f3d220ad9dff412495b SHA-256: 95c15b827c202762e3220ebeffed1ea20c3e3b19a59088b7a4211d102166cdee
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://lozipotod.ru/award?keyword=kreg+cabinet+making+booklet+pdf PDF link annotation
    • http://dujuzebekub.iblogger.org/64026187907.pdfIn PDF document text
    • http://sreda.city/network_security_engineer_resume_indiao8fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501037/normal_604077afeb332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_5fd64ad871645.pdfIn PDF document text
    • http://fofafowazu.66ghz.com/arrowe_hall_cqc_report.pdfIn PDF document text
    • http://kanudivuvim.iblogger.org/budget_2020_in_telugu_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413587/normal_5fd276ec0375a.pdfIn PDF document text
    • https://cdn.sqhk.co/xedasuzefer/jigfDb4/simesarusemanomif.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/hfjhKjh/project_n64_emulator_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5ffc2c02e0098.pdfIn PDF document text
    • http://tosety.xyz/how_to_repair_a_washing_machine_door_lock3g655.pdfIn PDF document text
    • https://cdn.sqhk.co/safajoju/pidhhja/12448092507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_5fcc8f7152473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479470/normal_6034327661c21.pdfIn PDF document text
    • http://maddot.space/annual_audit_report_contentsw7dy9.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/ehjhhuN/tawipevefudivukezojuwofol.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/fziijjN/96804092554.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuzumijeragevud.rf.gd/33023950711.pdfIn PDF document text
    • http://wupojonik.epizy.com/dikogezujojetob.pdfIn PDF document text
    • http://jokokisenekal.epizy.com/hazardous_materials_technicians_typically_perform.pdfIn PDF document text
    • http://wukosow.epizy.com/wojanukewoxoxof.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_off0000cda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA8 5468 bytes
SHA-256: 17225897d26a8747e02a97107d163256595cf8db3a7f366ee3d2b22d94ace797
font_01_sfnt_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 11040 bytes
SHA-256: b1198228eff3d80c7f6a6003ba85fff39202f846c448b3c6ed9961efa666610e

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