Malicious PDF — malware analysis report

Static analysis result for SHA-256 761bc19ae56bd9e5…

MALICIOUS

PDF

68.1 KB Created: 2021-02-15 05:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 192a2dd6cd40fec302d9d753e92b08ca SHA-1: bcbbc6bcb128f2140eae21a85113b813d4908e1c SHA-256: 761bc19ae56bd9e52df2366e66e7b976335d7a3a86af58e45c3d28a021a38884
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with many pointing to disposable domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wb?keyword=tamilrockers%20audio%20songs%20%20free PDF link annotation
    • http://vakakuwumegus.22web.org/photography_blog_wordpress_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/gCtgggc/39496914188.pdfIn PDF document text
    • http://callipakk2.site/livestock_business_plannea85.pdfIn PDF document text
    • https://kademagora.weebly.com/uploads/1/3/4/8/134850034/1359581.pdfIn PDF document text
    • https://cdn.sqhk.co/notigagamu/eBjagfT/tazotenil.pdfIn PDF document text
    • https://fizegebukuri.weebly.com/uploads/1/3/1/4/131453213/f4c7071e3ef.pdfIn PDF document text
    • http://igclienteam.com/62860917600zd2k5.pdfIn PDF document text
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/valipowoninuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tukutuxobolekub.epizy.com/free_jazz_piano_solo_sheet_music.pdfIn PDF document text
    • http://palakojum.rf.gd/famajodapiluvalofoj.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/free_residential_building_plans.pdfIn PDF document text
    • http://mokisomalew.rf.gd/hello_neighbor_alpha_3.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/feduzogaw.pdfIn PDF document text
    • http://nifiloxoburufi.rf.gd/drawing_ellipses_worksheet.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_off0000cb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB58 5356 bytes
SHA-256: e9327f3e1dfa11ac1730529baa55b7870ef50f36a9ffb2c439f10f5e117c5758
font_01_sfnt_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 11136 bytes
SHA-256: 682797a0a582e16593079a618f26fed0a2cc9575038372fdc039db642a76ad30

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