Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caa10320ae0ce4c…

MALICIOUS

PDF

64.0 KB Created: 2021-03-29 14:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 841b4d2a06a308ea0bccdf1454420389 SHA-1: 89d1342c1cce236d4318380bd067a442a22e0ec5 SHA-256: 5caa10320ae0ce4cf218beac563edd3df91577b7a0f70c0512b56e4dd71cc475
222 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with several pointing to suspicious or known malicious domains, disguised as educational materials. The 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SUSPICIOUS_LINK_LURE' heuristics indicate that these links are intended to redirect users to malicious infrastructure. The ML classifier also flagged this PDF as malicious, supporting the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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://yafferge.ru/strik?utm_term=cambridge+igcse+biology+book+online
    • http://copyrightshelpscenters.com/gandii_baat_season_2_anveshi_jaing5ag8.pdf
    • http://firstflirts.site/why_is_child_led_learning_importantsrfy5.pdf
    • http://alex-chekalev.com/zubenikimotavoxovezeke6wh89.pdf
    • http://logvoz.ru/noriwi2jjyx.pdf
    • http://ericksandoval.com/total_gym_1100_exercisesi8lik.pdf
    • http://securityofusersdevicesonline.site/aqa_gcse_biology_book_answersygzyt.pdf
    • http://emirofficialzm.com/bezanamenomoruezxc3.pdf
    • http://5-euro.info/the_ecology_of_human_developmentndhxc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/liwafo/ejercicios_resueltos_de_estadstica_moda_mediana_y_media.pdf
    • http://fobagiludo.rf.gd/emotional_intelligence_and_leadership.pdf
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_29e8de9d181c4cd7a2af13e4dd21c443.pdf?index=true
    • https://s3.amazonaws.com/tojazudibumogab/fipozu.pdf
    • https://c9254e9e-0e71-498a-8384-ab4c929b52b4.filesusr.com/ugd/0699ff_365f49bb224e43ec9422d49d79b5651f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d2f8a88b-aed7-43ee-a987-7731c6c21a87/hayward_ecostar_sp3400vspvr.pdf
    • https://s3.amazonaws.com/widuxade/germes_anarobies.pdf
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_487de696dbb243a3a6e59543c920fc02.pdf?index=true
    • http://bubejukajogimis.epizy.com/mevavijinafatopetubepej.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_4ca9e11720824f91b41aed8a8c0e4d84.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4be1f8da-9787-4638-8642-4713a0a51aa6/sunale.pdf
    • https://s3.amazonaws.com/daxemo/moonlight_sonata_3rd_movement_sheet_music_piano.pdf
    • https://uploads.strikinglycdn.com/files/33fd5d37-6da8-4fb2-baf5-6f22bbb8dad7/how_to_find_base_of_trapezoidal_prism.pdf
    • https://s3.amazonaws.com/jotizifime/wuwisororup.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbc.bin
ac9f706cf575bb45e91a5231c469f6c5d8da1c31a124155770567a8321347812		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 5472 bytes

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