Malicious PDF — malware analysis report

Static analysis result for SHA-256 a633483fee1411a7…

MALICIOUS

PDF

67.5 KB Created: 2021-02-13 05:38:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: fcd824692d5483c4e53fc585eb112c02 SHA-1: 19f9c1a001861f7ad8b4d58ba8e02e9d7bfcbe00 SHA-256: a633483fee1411a7a03b3313a020ea95991e31ec6968ab95f177db471be5322e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to external websites, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wix?keyword=colors+that+start+with+letter+j In PDF document text
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/40da362098d.pdfIn PDF document text
    • http://segwaywheelchair.ru/dell_precision_t5400_specs_cnetnwm5s.pdfIn PDF document text
    • https://wilosobofixi.weebly.com/uploads/1/3/4/8/134858013/sonobunamodarujo.pdfIn PDF document text
    • http://newyearshop.site/37513933173hjkmf.pdfIn PDF document text
    • http://itsamorem.com/pinball_arcade_ps4_tablesfcrvc.pdfIn PDF document text
    • https://kenibojowosude.weebly.com/uploads/1/3/5/3/135324683/xevumelije_rugosemefafite.pdfIn PDF document text
    • http://copyright-helps-team.com/42396843519bajl5.pdfIn PDF document text
    • http://svarka-aurora.online/bogue_inlet_offshore_fishing_report85ay6.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/SjhjchQ/gumball_machine_maker_video.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/fakuguvil/wedding_grand_march_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/33290453055.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/73962945970.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/avery_templates_labels_5960.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_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 4848 bytes
SHA-256: ed98a2e978cc27a21bc01cea7cf5ca9979412d88679055d5305c8bb6268da2fc
font_01_sfnt_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 10844 bytes
SHA-256: 2fe8031752033454fbaa48b0315e1636808759a58359c13a219171abed6c08ef

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