Malicious PDF — malware analysis report

Static analysis result for SHA-256 32412b12bf1c4170…

MALICIOUS

PDF

77.7 KB Created: 2021-04-08 00:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8f51b66194b45685e4b9c6107113b7ea SHA-1: b3f30528a860ce313a72c5b129d7e57e0c31bd1d SHA-256: 32412b12bf1c4170af480a855be947c3ca30e564ba3397d50acfd3bbea45174e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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/123?utm_term=android+pie+version PDF link annotation
    • https://cdn.sqhk.co/gipekoma/sNchbYX/solar_system_easy_projects.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_606d4e03c36ef.pdfIn PDF document text
    • http://alania365.ru/51235278789qg8ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_602b6e932dfaf.pdfIn PDF document text
    • http://itravelgr.com/how_to_be_adaptive_to_changewmr7s.pdfIn PDF document text
    • http://get3creditscores.info/how_to_become_a_freelance_logo_designer8jmw2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470961/normal_5ff9751865563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_6037657ed31a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404984/normal_603ce0e87bf75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368745/normal_5fdfb14b5019f.pdfIn PDF document text
    • http://blockingscenery.com/16674061301imo8m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_606e21dda7074.pdfIn PDF document text
    • http://giocodigital.fun/zesuxeztgbiq.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/a4bjafa/4_row_air_planter_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_602f9d78a1b11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_605d1fb226348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_88825f6c733846f69c83c34ff768ccba.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_346f4ddd586c4683b96507c15bf4a130.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/what_is_enlightenment_immanuel_kant_sparknotes.pdfIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_cc03bef117b34fa8a610d6ac5a4158ce.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_9761524022eb4f2dbc7238a2520ac792.pdf?index=trueIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_c9226b904081463eb2b6c83b921e4f4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/pusulomizojuzutebomubo.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/plague_inc_evolved_free_android.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/27750556606.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/neduradalekadij.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_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 4760 bytes
SHA-256: 384c5d2c7711a7dcb5ef1596398125df5d7d6cafbaa986f161fe3651bfef63b0
font_01_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 10776 bytes
SHA-256: f3cc74a0edf6215fc7cc922e1f454a9556b35f21fab57658b4172e4528c91f8b