Malicious PDF — malware analysis report

Static analysis result for SHA-256 497a5eee207a90cd…

MALICIOUS

PDF

118.1 KB Created: 2021-03-11 22:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 549fb58860ff4dca05dca35d51a249c8 SHA-1: 2553c71873449036db9d2ec50b620a9b94f49e19 SHA-256: 497a5eee207a90cd93dc153380ec28c65d342e46562f4bf8b6495e0820a9fe95
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, a common tactic for SEO poisoning and phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, with one prominent example being http://tawaxinazaka.rf.gd/dojozonadekupewujoz.pdf. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=what+is+a+feature+type+leader+was+nelson+mandela
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/df8009edd13eaa.pdf
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/f792dccfd4380.pdf
    • https://xatotowo.weebly.com/uploads/1/3/2/7/132740458/remere_netisaruladuse_dudaxuj_denosateditobew.pdf
    • http://meduduwaje.22web.org/37814549135.pdf
    • https://dasatupulike.weebly.com/uploads/1/3/4/1/134131314/pufekuvasu-jogovopasozije-zexemami-bazakosuwo.pdf
    • http://rufejupewanun.iblogger.org/tus_zonas_erroneas_dr_wayne_w_dyer.pdf
    • https://wemafijape.weebly.com/uploads/1/3/4/7/134775870/toron.pdf
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/cfc6d7842.pdf
    • http://mynasert.online/lifigiwifeftlbk.pdf
    • https://xudinenudomojuv.weebly.com/uploads/1/3/4/3/134356320/bifipuv_pemepatev_bufiwunisezapat.pdf
    • http://carbags.site/54597335800iap2r.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tawaxinazaka.rf.gd/dojozonadekupewujoz.pdf
    • https://uploads.strikinglycdn.com/files/8ce956cd-3100-42be-bb2a-6bf8e3dd3232/zulifovumaretapexebe.pdf
    • http://vexowiwoputam.rf.gd/acorn_180_curved_stairlift_fault_codes.pdf
    • https://uploads.strikinglycdn.com/files/ead766ac-bb01-4d7c-8e5c-558a937266af/28272078360.pdf
    • https://s3.amazonaws.com/xijilesuzuxo/guvikamuzaxabekiw.pdf
    • https://s3.amazonaws.com/befarekogol/chromecast_app_android_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/0902be0f-98ef-4f87-aad7-6d6dee89ce41/metal_gear_solid_5_quiet_blood_outfit.pdf
    • https://uploads.strikinglycdn.com/files/043a815b-1915-4005-adf1-97ebb3687498/pafonevupitukusegevima.pdf
    • https://s3.amazonaws.com/wazagidonux/cbse_7th_grade_math_book_answers.pdf
    • https://uploads.strikinglycdn.com/files/2eb6530a-1446-4e9d-bccb-5af787fe94d7/xazodelutoxevupemu.pdf
    • http://zivuneko.epizy.com/50971167762.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001920a.bin
7d2600b903a93e2820cb249c31a2ccf9f5872acb8080149fde51edb5b5981f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1920A 5488 bytes
font_01_sfnt_off0001a4ab.bin
eb8de45b540778b8700a71fcc1f6381c897191fd329e58dab5c7f7083dc27b49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4AB 10964 bytes

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