Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc1e9dfb3771d79…

MALICIOUS

PDF

83.5 KB Created: 2021-03-16 02:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 76eed1875980f40cf6ab58c95436f15c SHA-1: ed963216a0d3b3b768ba4561e1a6eef5f90a1334 SHA-256: 4dc1e9dfb3771d79980c551425b501755f985f11d1b0c38474e4ecf00bdba537
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 0.9995

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=star+method+questions+answers+interview PDF link annotation
    • https://cdn.sqhk.co/letiludixo/iejbNG9/how_to_do_graffiti_art_with_spray_paint.pdfIn PDF document text
    • http://uscreditmonitoring.info/13_original_colonies_map_worksheetc920q.pdfIn PDF document text
    • http://prizinsta24.online/fufunowelojileduzolilablervp.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/what_are_the_different_types_of_framing.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/Rgegdrk/directv_now_login_customer_service.pdfIn PDF document text
    • http://busivel.xyz/strain_tactics_free_downloadmg51t.pdfIn PDF document text
    • http://tiktokhd.design/black_xmas_2006_castmqfiu.pdfIn PDF document text
    • http://parhelifrl.space/geriligobasoxujaj8cufz.pdfIn PDF document text
    • http://douchelabs.xyz/974609225304zuj0.pdfIn PDF document text
    • http://nebo-baikala.ru/stumbling_on_happiness_audiobook_freevsodm.pdfIn PDF document text
    • http://agentsecure.space/zombie_catchers_2_apk_modix63w.pdfIn PDF document text
    • http://delaem-sami.online/dnd_5e_book_of_ancient_secretshdyot.pdfIn PDF document text
    • http://waliduv.mypressonline.com/tokitajoruwovameb.pdfIn PDF document text
    • http://antileqphh.site/40444239100v8hs8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/naxozelozude/53146126458.pdfIn PDF document text
    • http://tixixumusugik.rf.gd/sixilaxijimat.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/19725154937.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/63959930537.pdfIn PDF document text
    • http://wewolasa.epizy.com/fuzojeduvigav.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/jefexexojeg.pdfIn PDF document text
    • http://puribisipup.atwebpages.com/tivojol.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/free_format_in_rpgle.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 5296 bytes
SHA-256: 3463fc8c9424c6c96372dd213af1903bd881ae94164507a9b24ce5846ff112ce
font_01_sfnt_off00010f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 10580 bytes
SHA-256: b351b30b53632f00fe22454147009c162ee247a7e6b00dc4c68129a8f6d11d7a
font_02_sfnt_off0001338b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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