Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fefff8316ea73f…

MALICIOUS

PDF

76.3 KB Created: 2021-04-10 22:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6cb37a6505d153979219bcb43c5aed47 SHA-1: 26274a6ecd949f57e925000a7d08b0d7ee52980c SHA-256: 65fefff8316ea73f88bdad9809136bc1f829c83b33f53e7cdcdb89cbc863592c
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains strings that appear to be search result titles, reinforcing the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=cambridge+latin+course+unit+1+stage+7+translations In PDF document text
    • https://cdn.sqhk.co/banijuwa/c9eoBhe/calendario_laboral_2019_nacional.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/cisco_sg200-50_console_port.pdfIn PDF document text
    • http://juxowupekabaf.mygamesonline.org/komumurutusofiloxaseget.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/zwhgnhb/dotewumome.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/85731567853.pdfIn PDF document text
    • http://mopowataxix.medianewsonline.com/fleece_beanie_pattern.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/gHhbgid/aye_funny_sound_effects_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/X2uYggp/islands_in_the_stream_bee_gees_tribute.pdfIn PDF document text
    • http://lerimofo.mywebcommunity.org/applied_physics_lecture_notes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satovimowenijor.myartsonline.com/differential_and_integral_calculus_by_feliciano_and_uy.pdfIn PDF document text
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_045dd9e7df27471896e3f139ed7322b2.pdf?index=trueIn PDF document text
    • http://dinukafewu.epizy.com/52849351535.pdfIn PDF document text
    • http://kalasoziluxolim.myartsonline.com/66431651053.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_bbda925247f848758b116f184a2745dd.pdf?index=trueIn PDF document text
    • http://vezoxonu.epizy.com/journal_of_capsicum_frutescens.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_ef4a27190fd042ab8b88edabf8d4942f.pdf?index=trueIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_2b83fb2727a44b418b95eae462ff1294.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_13d4938b9887493eb7ad859a09d11b79.pdf?index=trueIn PDF document text
    • https://6f29901e-f5c9-4775-879c-97b2de5c8d5b.filesusr.com/ugd/0bf195_fe20e41d840d47ae89302a28813695bd.pdf?index=trueIn PDF document text
    • http://tefetuzuzip.myartsonline.com/gemikeloronogedure.pdfIn PDF document text
    • http://rajokonola.epizy.com/39995522839.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_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 5436 bytes
SHA-256: 84cd21b83c413c029bb346a6f96e5ac7c92b876c4a25febac0cef1f40efc603f
font_01_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 11628 bytes
SHA-256: 04af97637c7e8b81dd083e9f11e296e427a230abe417941ace05091028eaf59d

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