Malicious PDF — malware analysis report

Static analysis result for SHA-256 5daea46e15c508c6…

MALICIOUS

PDF

74.7 KB Created: 2021-03-18 17:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 47bcfba26717ae31fe8bd10f5b1867f5 SHA-1: 5f178e4b4d3a652dd49339f715fe4599b803c3e3 SHA-256: 5daea46e15c508c688751014f0f2d668ee7fe4d1ca5f019c5548c47520e5dbe6
244 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to attract traffic. The document body, though heavily obfuscated, suggests a lure related to academic performance. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicates malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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://dafemum.ru/award?keyword=effects+of+extracurricular+activities+on+academic+performance+thesis+pdf In PDF document text
    • http://komaxinatobofe.medianewsonline.com/funny_writing_prompts_for_5th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/aYpYNHE/prem_top_scorer_20_21.pdfIn PDF document text
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/6021627.pdfIn PDF document text
    • http://hellesypakk.online/roland_td30_module_for_sale7ayon.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/gctvkwF/mobile_home_coaches_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/worupageke/pyEfgi9/primary_school_teacher_appointment_letter_sample.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/how_to_reset_dtc_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/uOjjjc2/motenijozimaguxa.pdfIn PDF document text
    • http://sale20.site/vamojamefepulu05sc5.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/jjDfxij/spacex_live_bbc_news.pdfIn PDF document text
    • https://cdn.sqhk.co/fakomuse/djdiaie/63223043175.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/hfhiBXC/seril.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/HoKkhcH/best_sky_map_app_ios.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/80661208784w8usl.pdfIn PDF document text
    • http://leon-stavki.info/nijigomexemidijafiwarkvvs.pdfIn PDF document text
    • http://zagozogenef.sportsontheweb.net/bigef.pdfIn PDF document text
    • https://juzunuxav.weebly.com/uploads/1/3/4/3/134316531/danupawo.pdfIn PDF document text
    • http://shop-onlain.fun/pizubijubawupubusazemubr4spa.pdfIn PDF document text
    • https://cdn.sqhk.co/ganinidunop/Ydgj2mH/4541812202.pdfIn PDF document text
    • http://sanelobazigi.medianewsonline.com/casting_defects_nptel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://defakulid.atwebpages.com/bofum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41698441-da31-4fed-b0d4-8ca7fcb6423c/what_does_symbol_mean_in_algebra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1db84d72-6758-41d9-b8a9-608d7170a67a/godefurozer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d09cfd6-2cc5-4642-9dca-b2e2b87b5a0b/74781140088.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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 5480 bytes
SHA-256: c5140d2e11e12ee737087a972a57d346acf03577895d3679033711865a9cbc24
font_01_sfnt_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 10652 bytes
SHA-256: c157d49ae1b730f8b59a5cc566368c9f24d75ff9ac71d6e1ec941514935b420a