Malicious PDF — malware analysis report

Static analysis result for SHA-256 d855ba86e447142f…

MALICIOUS

PDF

68.9 KB Created: 2021-02-17 05:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ec337d9d2d1986f3dd699541c55a2cd7 SHA-1: 9ad3341e086d0975cd0423bb8769fa724afa9069 SHA-256: d855ba86e447142f87ef8cc6df50c8cd696531a3564dfe82687e3d182e90ed6e
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, 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 directly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites.

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
  • 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/aws?utm_term=genie+intellicode+is550%252Fa+year In PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/e0879846e38a0c.pdfIn PDF document text
    • https://mivezosikobo.weebly.com/uploads/1/3/1/4/131453246/5311882.pdfIn PDF document text
    • https://burerekubexu.weebly.com/uploads/1/3/1/3/131381452/425da77.pdfIn PDF document text
    • https://cdn.sqhk.co/wixumenez/FIjjjcD/2996764349.pdfIn PDF document text
    • http://pinerapidsrr.com/minezaferaxuzeraxabogorehek0h.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/fgjTjil/seashine_adventures_cabo_san_lucas.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/4514432.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/hkHeAih/xitutoxerufa.pdfIn PDF document text
    • http://giocodigital.space/426757118827598f.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/tRhaNNh/tiny_bird_garden_deluxe_free_download.pdfIn PDF document text
    • https://sipelebe.weebly.com/uploads/1/3/4/3/134312525/5217899.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/vip_access_mount_sinai81ps1.pdfIn PDF document text
    • http://winclean-shop.space/words_in_a_pic_level_10660uy33.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/jjijjbL/10097384328.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sirovorisolilu.rf.gd/tataxitowubabepoj.pdfIn PDF document text
    • http://fixadamobus.epizy.com/fisunedema.pdfIn PDF document text
    • http://fusuxitizubuka.epizy.com/islamic_names_dictionary_in_urdu.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_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 5368 bytes
SHA-256: 69ba0459ac449f1b47c3772653d5c83ab2e7dcaae086f657c4b9a986bae779dc
font_01_sfnt_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 10688 bytes
SHA-256: b7543df84d0af5df96892b7a34dd62884759056927a386a9cbfe0ede2a4fe9f5

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