Malicious PDF — malware analysis report

Static analysis result for SHA-256 8507297cdb832598…

MALICIOUS

PDF

76.6 KB Created: 2021-02-08 17:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 80a02f8c79b9327d7ab30991638211ed SHA-1: dff6f7aad377135f434dcef175857bb052b60d1e SHA-256: 8507297cdb8325983faf6c9c48b68477585f0e4b0faa764f343ed5f6e45f2f35
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 link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of spearphishing attachments designed to redirect users to malicious sites.

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://leonvi.ru/123?utm_term=microwave+popcorn+popper+instructions PDF link annotation
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/bowafitemagenemur.pdfIn PDF document text
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/rediv.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/2002734.pdfIn PDF document text
    • http://rejonozafazimut.22web.org/zobedogukagusabibunalu.pdfIn PDF document text
    • http://zafogititug.22web.org/memorial_service_programme_template.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/9360456.pdfIn PDF document text
    • http://bilabugova.iblogger.org/dr_denim_dixy_size_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wubumeze/ifAichf/buximugezividasadosut.pdfIn PDF document text
    • http://morj.space/our_guide_tv_perth_wa4v1hq.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/i4ieEjf/1416708546.pdfIn PDF document text
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/movos.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://mibelajute.epizy.com/fundraising_chart_thermometer_template_word.pdfIn PDF document text
    • http://nawogov.epizy.com/black_hole_theory_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/bulacan_state_university_school_uniform.pdfIn PDF document text
    • http://mupefapakag.rf.gd/96516191683.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/feed_conversion_ratio_in_poultry.pdfIn PDF document text
    • http://finunaji.rf.gd/primary_amenorrhea_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/django_template_if_else_elif.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_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 4936 bytes
SHA-256: 3bbe9aa7494d3581c1ea0710b9e13834b0c44f03917b22a7e6efe4451d5274fc
font_01_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 10432 bytes
SHA-256: 23d10e49d644c69d0125c82482eb3fb9ebe54eb5d6cc8e5edd6ab520b630d612
font_02_sfnt_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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