Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a91eb53256a486…

MALICIOUS

PDF

79.7 KB Created: 2021-04-04 12:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f6e73bbc48017c2dfa3bf40c5ada94a1 SHA-1: f72f35172b860a9d371f3b1e5303e198c46432dc SHA-256: 33a91eb53256a4861aae18e423daa1dde747eda4bd513f8aa94ab26f1e01cc2f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, and one prominent URL related to a Kindle issue. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=kindle+is+stuck+on+empty+battery+screen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501645/normal_606932d774dc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_60431208e07a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414335/normal_5ff8c82681c0f.pdfIn PDF document text
    • https://penadijuzebi.weebly.com/uploads/1/3/5/3/135310947/gelunozeg-xonisuvejazuxak.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/eTH4hc4/xubaxasemuziliwiberubipo.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/dbmjhje/download_photo_editor_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481990/normal_5fc83dc673e78.pdfIn PDF document text
    • https://cdn.sqhk.co/setupemup/ck7jegd/chrome_and_glass_shelf_tower.pdfIn PDF document text
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/9478331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447460/normal_5fe31f3e558db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481163/normal_60242fb19656f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_601b8023e8f26.pdfIn PDF document text
    • https://kilexudu.weebly.com/uploads/1/3/5/3/135347894/zunexij-repawakemusob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403421/normal_600ef6f8d805f.pdfIn PDF document text
    • https://vejotawugupexo.weebly.com/uploads/1/3/4/7/134756202/6905823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443799/normal_5ffb2a23b3f79.pdfIn PDF document text
    • https://cdn.sqhk.co/panajevem/fjhhbij/the_roman_empire_map_worksheet_answer_key.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/tobovunoberiki/how_to_make_thesis_statement_example.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/danuxunusarijodiw.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/noximelokakigapur.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/69293796249.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_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 5492 bytes
SHA-256: fa24298b07b70d08124324988525e7da9c1b36c5f641373c1ca56563766ac7c0
font_01_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 11396 bytes
SHA-256: 923d73aa66fb50af5ee83c22253141cdba64964fe8dd720c5b8b6e36654343f5

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