Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf1c2bafe53b5f9…

MALICIOUS

PDF

75.9 KB Created: 2021-03-02 02:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0105d29e473884cd2844e81582676789 SHA-1: 21c6459dc462f6ba261fb1659e6864c398b7f478 SHA-256: ecf1c2bafe53b5f9d3e501cfdcaca33ca5d70dc823777e251df125429dc39f4e
206 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It employs social engineering tactics, specifically a 'Browser Install Lure' and 'ClickFix' attack, instructing the user to install an extension or run a command to view content. The document also contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or distribution point for malicious content. While no scripts were directly extracted, the nature of the lures and the presence of external links indicate an attempt to exploit the user's trust to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maypoin.ru/strik?utm_term=will+logitech+mk320+work+with+mac PDF link annotation
    • https://cdn.sqhk.co/gajerivab/fgihes0/padoruwuvanirojanuwozikom.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/vitubixup_gorugav_luvigaraduxozen.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/87408449105.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/jbhjf2k/funny_mail_notification_ringtone_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sabeludejem/rnzhfji/39682391688.pdfIn PDF document text
    • https://fuxilidunud.weebly.com/uploads/1/3/5/3/135314653/2613788.pdfIn PDF document text
    • http://piwulefimer.22web.org/guide_book_publishing_st_louis_mo.pdfIn PDF document text
    • https://rojabufofunos.weebly.com/uploads/1/3/0/7/130776514/kopokosubosezo-witenawazabomu.pdfIn PDF document text
    • https://mulofujuxemo.weebly.com/uploads/1/3/0/8/130874025/3630021.pdfIn PDF document text
    • http://nuxefigemotak.22web.org/ronaldo_wallpaper_hd_4k.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/jowutoneranemuk/tanarojirub.pdfIn PDF document text
    • http://mafevela.rf.gd/who_was_the_dog_in_old_yeller.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/fagepokevudar.pdfIn PDF document text
    • http://dapuzuro.epizy.com/android_terraria_full_apk.pdfIn PDF document text
    • http://lejorusajevi.rf.gd/77670002279.pdfIn PDF document text
    • http://pijularof.epizy.com/51008088003.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/datememopurivijuz.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/ayinmaiden_skyscale_guide.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_off0000e9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 5644 bytes
SHA-256: 0fdfbddf4e8db7927d6928cde1878948d3d0d08be66c93e25312c516eb1bdc4a
font_01_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 10980 bytes
SHA-256: 2f4c429214e7d836ecdca04667ff91d9f56a241087cc51f486a5a6b888758e92

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