Malicious PDF — malware analysis report

Static analysis result for SHA-256 5703f670408f1286…

MALICIOUS

PDF

79.3 KB Created: 2021-03-13 16:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c38607f88b9e5099333e015370b31140 SHA-1: 9fab1b4283f605d7fb2b536de171f59e30888d25 SHA-256: 5703f670408f1286795035bfea31ac06bc7a2d593864e7db88c0169f141a01b6
186 Risk Score

Malware Insights

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

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 0.9964

Heuristics 6

  • 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 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://seumenha.ru/award?keyword=actuarial+mathematics+soa+pdf PDF link annotation
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/tulaguxikofiwinitowo.pdfIn PDF document text
    • http://fit-italy.space/jititopavugexerimogovirhg0fm.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/mezetakepelama.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/OjgggSe/craigslist_los_angeles_county_apartments.pdfIn PDF document text
    • http://hallhq.xyz/street_fighter_alpha_2_mod_apkmfodd.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/nighfhi/othello_movie_1995_soundtrack.pdfIn PDF document text
    • http://counterman.ru/89979438548vribv.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/fLzjejb/salaxan.pdfIn PDF document text
    • https://cdn.sqhk.co/tezabulaw/dgf7jjq/turugosonakosu.pdfIn PDF document text
    • http://kekasot.22web.org/jarvan_guide_jgl.pdfIn PDF document text
    • http://dawavuwera.22web.org/58689141604.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/h7nKjiX/42743152961.pdfIn PDF document text
    • http://peskomment.ru/mitetoxajonupanosuiv2zx.pdfIn PDF document text
    • http://priz24.site/el_lazarillo_de_tormes_tratado_cuarto_resumenq9szg.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/hiZhbXv/jakafukok.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/XSYDggP/quickbooks_shipping_manager_fedex.pdfIn PDF document text
    • https://xuvupidorok.weebly.com/uploads/1/3/1/4/131407629/tikimoberanir.pdfIn PDF document text
    • https://cdn.sqhk.co/jutirupot/diaUieR/microsoft_sharepoint_training_courses.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/hdgjaRQ/angry_birds_blast_level_467.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3b631b-7065-486b-b2b5-610e58ecd639/pukag.pdfIn PDF document text
    • http://dutataratoboruj.rf.gd/61860916057.pdfIn PDF document text
    • http://dikefesuzu.epizy.com/22099692363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b072ab-43e0-408b-84c5-df96909c2fc4/i_want_to_walk_as_a_child_of_the_light_hymnal_1982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e7e36a2-071d-45d1-9188-0a8efd833d15/how_to_read_candlestick_chart_for_trading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7528656-8580-42a5-a003-73ea80e10746/kenmore_canister_vacuum_cleaner_hose_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eadda1e-4360-419e-a692-5de4e3cb2cd9/68742976834.pdfIn PDF document text
    • http://befatig.epizy.com/80316437756.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_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 5384 bytes
SHA-256: f134a0b02f40d24bafacdcff4a6561bb2427a1e93c7c7a63586944548d03f56a
font_01_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 12772 bytes
SHA-256: e48d6be9253acbaf3d018f0a5b9ddb163688a85975a907f120bd955d61c40d6f