Malicious PDF — malware analysis report

Static analysis result for SHA-256 5674c7fb5c92f633…

MALICIOUS

PDF

79.5 KB Created: 2021-02-19 20:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a67f2b6d9ad7c632b9dd6c21ea41afc6 SHA-1: ae9df6306fe28420cc0c823d9a0609303fe72093 SHA-256: 5674c7fb5c92f633b0098cff095482b55fb9b354fc885ae59994c70a12c1d911
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file exhibits malicious behavior by hosting a large number of external links, many of which are designed to redirect users to potentially harmful sites. The presence of a known malicious redirector URL and numerous links on disposable hosting indicates a phishing or scam attempt. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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.
  • 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=manual+control+remoto+universal+rca+codigos In PDF document text
    • https://gofuzuxelizexo.weebly.com/uploads/1/3/5/3/135391542/77cab5c340f.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/the_sanford_guide_to_antimicrobial_therapy_2018_48th_editionr3p5b.pdfIn PDF document text
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/1008d5ac0a.pdfIn PDF document text
    • https://wotuterivakevom.weebly.com/uploads/1/3/4/6/134608936/jezibolinolo.pdfIn PDF document text
    • https://wowavimisaken.weebly.com/uploads/1/3/0/8/130814021/nugosele-kunosix-lutegu.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/8272861.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/5mhg0HE/relaxing_spa_music_10_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/eiggghV/incardoc_pro_elm327_obd2_scanner_bluetooth_wifi.pdfIn PDF document text
    • https://tovexalo.weebly.com/uploads/1/3/5/3/135348509/8540196.pdfIn PDF document text
    • http://repetitor-ru.ru/carrier_aircon_user_manualijpb7.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/OiGjhhj/86262989381.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/jeAWXhb/turquoise_blue_diamond_glitter_live_wallpaper.pdfIn PDF document text
    • https://gijesetezoludad.weebly.com/uploads/1/3/5/3/135348421/jirelijogog-zigozami.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/2vl4vjb/6430170920.pdfIn PDF document text
    • http://myfavoritesun.xyz/autoalarm_cobra_instrukcjaoblu3.pdfIn PDF document text
    • http://fresh-ita.fun/4961560057627y4p.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/fhfiabW/sijanifinamefip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/cual_es_el_significado_de_caliciforme.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/49266773609.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/7525188407.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/bluetooth_suite_win7_free.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_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 5324 bytes
SHA-256: 41f30136ac9e13524487b93fea9f4fd770a89d14b8649be62b2c57a153e82654
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 10572 bytes
SHA-256: 2928bc2a1c4b5969b58347f8ce0cf1e415e5fd160b4434587cc08d385a4bb5cd

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