Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98fdd8e8bee7e81…

MALICIOUS

PDF

68.0 KB Created: 2021-04-06 16:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: b8b2818129b03c8d25431923ec8c292e SHA-1: faca529983ed2286c3b7ef445c6a37b986f0e56f SHA-256: a98fdd8e8bee7e811c2dee982fa22b69ccee85b458c4218750c2376a70d466fe
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains keywords related to IBM DB2 manuals, suggesting a lure to trick users into clicking malicious links.

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://crophysi.ru/wix?keyword=ibm+db2+v12+manuals In PDF document text
    • http://nncucuucuc.space/sword_art_online_alicization_ending40gln.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/57957195227ni2re.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/jcgcjjn/fodumolokekozirujaduxif.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/hiajic7/geviva.pdfIn PDF document text
    • http://kungfumalibu.com/mojobetilibigavetpxelx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_80eccf65ee0642898fd61c67994558e3.pdf?index=trueIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_55a436cd8dda4bc5bc6216b68a12d6d6.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_f9e35cad2147438eab2bc3ab96cc2cc1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29575bcd-aa8b-4a7e-bcaf-2cd52242579a/25817148830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fcfcbf-d974-426a-b7e1-1fdf9ba45a6b/38774853727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37767e5e-6a1f-49fe-9d90-8692be07ff72/literary_criticism_an_introduction_to_theory_and_practice_charles_e._bressler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca45948f-bca1-4414-9a44-625beed3295d/12889809596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac081b8-d941-4c7e-8026-c962d039ea48/vidudugapulifazomutijeged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697dc733-46ab-480b-8dd9-d6844a6b155e/36579151640.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_c244f35e25a040e48306251dfc1e9231.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca85c2c-c9fd-4e26-aed4-4bdaae98203e/56943180122.pdfIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_119943c7d7cd4125aac3ffea65a814d1.pdf?index=trueIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_f4c2518b45ba4d49acbbe52dac113535.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_756aec95f76d48eaaede7784bb798311.pdf?index=trueIn 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_off0000cbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 5196 bytes
SHA-256: 2c0b5417e3833efaa10763e10639a1488432d4d401e71d297c3c9fb9b6542e31
font_01_sfnt_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 10860 bytes
SHA-256: 379c27f279f3d992ffcce3308779a903a605c6a5a3516fcec0935a44a8d04221