Malicious PDF — malware analysis report

Static analysis result for SHA-256 26efb8cbddf723f5…

MALICIOUS

PDF

75.3 KB Created: 2021-04-05 10:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4b3f8271f2115d77fbe692c740320e72 SHA-1: 995280cb6c7c9d9416f6c8342d67808e2a8bcbd8 SHA-256: 26efb8cbddf723f57b8cd3ab1d54cb93d92f0772bd2b82f010e1788b096b7897
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, and it contains a large number of external links, many pointing to disposable hosting. The document's content is obfuscated but appears to be a lure, likely for phishing or malware distribution, disguised as a wedding invitation. The presence of numerous external links suggests an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/123?utm_term=golden+wedding+invitation+template PDF link annotation
    • https://cdn.sqhk.co/malakizojaji/3jjCjg1/mekumajiranogatigubaxara.pdfIn PDF document text
    • http://votubuv.22web.org/how_much_does_a_mechanical_engineer_get_paid.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/djbidja/patimujisufonema.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/Uhcifvt/37202060455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palalujopaxuv.epizy.com/lamebuw.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_56c8716813c749c68c7d838e3be7b518.pdf?index=trueIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_98c645bb6ad743fdbc0f9059f054bb5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f81c89-e132-4ad5-970d-261bf2d62361/pifagekobifapubajomizu.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_dd4bc1e8aab84c97abf49862b828a6cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b513b1a8-3c78-4908-aed6-9544abdcd29c/25563905807.pdfIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_fd96a6d918964f58a4ddc414b7c7d433.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5e255e-1975-4a3a-aa82-8dacf803e4a5/biografa_de_grandes_cristianos_descargar.pdfIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_5df45fe3da604d57a4b962fd137c5c80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/516b4415-dd03-41f2-938b-d52b26413a5f/ar-15_fixed_stock_sling_mount.pdfIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_0d14103a38334198b3775c9362ccbc7d.pdf?index=trueIn PDF document text
    • http://bipedok.epizy.com/76873898018.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_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 5188 bytes
SHA-256: b534dd6df4e65340228ba368c128e8929c94634c53c3690fa93ba8bccdefe761
font_01_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 10956 bytes
SHA-256: e8c6802d1406b795137b4ca40782ff897c50cb07c0a3c53b1f06831470b85fcc

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