Malicious PDF — malware analysis report

Static analysis result for SHA-256 776bfdb860dc8f59…

MALICIOUS

PDF

79.8 KB Created: 2021-05-15 14:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5dab0bff8e2d864f24b64257eea688e3 SHA-1: 7ce7d84a643fe1c16a396c6793c2b63856da7c82 SHA-256: 776bfdb860dc8f59a2b0adc84b69c8a08b7460e972954f0e30f18326b7becd98
126 Risk Score

Malware Insights

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

The PDF contains a high number of 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 indicative of techniques used to redirect users to malicious sites.

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://dugedepap.ru/strik?utm_term=what+is+a+call+to+action+in+a+speech PDF link annotation
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/xuwil_veragevixixev.pdfIn PDF document text
    • https://cdn.sqhk.co/puxitika/hb5s0ja/amazon_photos_family_vault_help.pdfIn PDF document text
    • http://xutifufaxe.mypressonline.com/71873230288.pdfIn PDF document text
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/pepedupod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_6018062dae192.pdfIn PDF document text
    • http://zedakobogesa.mypressonline.com/programa_de_auditoria_administrativa.pdfIn PDF document text
    • https://satewode.weebly.com/uploads/1/3/1/4/131407014/renikadaziwenapa.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/W6ghhd4/ufc_254_fight_card_time.pdfIn PDF document text
    • https://jelisewisu.weebly.com/uploads/1/3/1/4/131410299/pilununisalorufabodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_6015a48e7debe.pdfIn PDF document text
    • https://romarifekaxa.weebly.com/uploads/1/3/2/6/132683260/b2198c.pdfIn PDF document text
    • http://libidisebosuv.22web.org/vuvegeba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445869/normal_5fcba4dee7d1c.pdfIn PDF document text
    • http://susarivusu.22web.org/30885984059.pdfIn PDF document text
    • http://bejawutipage.mywebcommunity.org/el_libro_de_urantia_precio.pdfIn PDF document text
    • http://wokodanib.getenjoyment.net/ati_active_learning_template_medication.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://nujugeteteda.myartsonline.com/alyaum_newspaper.pdfIn PDF document text
    • http://xuwunokebisul.rf.gd/doodle_god_apkpure.pdfIn PDF document text
    • http://wajifinome.epizy.com/wilfred_owen_anthem_for_doomed_youth.pdfIn PDF document text
    • http://tirisesu.onlinewebshop.net/lezapizaretidinorolepefe.pdfIn PDF document text
    • http://refulixal.rf.gd/84175598241.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_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 4728 bytes
SHA-256: c1d7bec5b9438fc133055d955525bae6b61ff356fd63f8d2d8816e4c54c61215
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 10636 bytes
SHA-256: a5b505136d7b9d000c9e68fbfa465511a0e989bc813ec0bf5454fdeba14b6d2d
font_02_sfnt_off0001238e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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