Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f5a955ba408399…

MALICIOUS

PDF

74.2 KB Created: 2021-02-24 03:19:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 971739465e1c01f3d39fa99d1d24c315 SHA-1: 5bc8895a315f99b456845ff114eb7866b7cbe5bb SHA-256: f1f5a955ba408399a399770ef5029c7840a13e01eb935114ea6d94255f8f5059
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body contains garbled text, but the presence of numerous embedded URLs pointing to disposable domains and link farms strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=how+to+setup+netgear+3700 In PDF document text
    • http://kapusta.pro/32645960095yjcyv.pdfIn PDF document text
    • https://cdn.sqhk.co/koletexun/jahjhd7/90_s_music_rap_hits.pdfIn PDF document text
    • http://logmeinnow.xyz/27608707311zbbsv.pdfIn PDF document text
    • http://affilateapp.online/56029389912a3f19.pdfIn PDF document text
    • http://tedabelefodeb.22web.org/53405263929.pdfIn PDF document text
    • http://clientesdkb.com/algebraic_expression_tutorialr61pl.pdfIn PDF document text
    • http://fresh-ita.space/sennheiser_rs_175_digital_wireless_headphone_system_-_blackg92mq.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/f0GghyL/78559494286.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/jgfiiMP/gun_sound_sms_ringtone_mp3_download.pdfIn PDF document text
    • http://terubib.22web.org/paloma_water_heater_code_p1.pdfIn PDF document text
    • http://pigozolifafaw.iblogger.org/48257818735.pdfIn PDF document text
    • http://biomaniix.website/poxowoxukefukusokapojakk8ge.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/gQ6gdib/easy_dessert_recipes_with_green_apples.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/yigii5d/80924824275.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/2rFsFjd/online_slots_usa_legal.pdfIn PDF document text
    • https://cdn.sqhk.co/ridasozewe/gcgcgfN/nudugobojikelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zozadugaweguj.epizy.com/45922547987.pdfIn PDF document text
    • http://kamagudos.epizy.com/tuxikefazikivusiwumob.pdfIn PDF document text
    • http://bajajer.epizy.com/dd-wrt_setup_bridge_repeater.pdfIn PDF document text
    • http://nuwisumir.epizy.com/what_does_the_white_witch_represent_in_the_lion_the_witch_and_the_wardrobe.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_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 5392 bytes
SHA-256: b6b39d3c968b035699b8206395f1d75ceaefd459fc6934b9b69897a0581ec4ce
font_01_sfnt_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 10336 bytes
SHA-256: 10f977d4f1710ea180a3213efc62c37ab052601bf814752a9f52e58bf25439ec

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