Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f0514582f45ca1…

MALICIOUS

PDF

108.1 KB Created: 2021-04-07 01:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 88e9b627eb94f7a145b9ceae744adcd3 SHA-1: 5aebeb0bc15321e0687d42b0db264670fab36ef5 SHA-256: 11f0514582f45ca1453934d365094a7f1ffad9a6704e59a80140246db2d3e900
194 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. It uses an invoice-themed lure. 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 0.9989

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=printable+log+log+graph+paper+pdf PDF link annotation
    • http://ruguwafe.scienceontheweb.net/best_speech_on_covid_19.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/jbSbjex/splash_lagoon_nearby_hotels.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/cC19tgd/games_online_unblocked_66.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/FQQgi43/golf_chipping_hitting_behind_ball.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368504/normal_5fcc51c4ea1dd.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/8RxghNn/nimoneraxigef.pdfIn PDF document text
    • http://nokilibetajew.mywebcommunity.org/ejercicios_aumentativos_y_diminutivos_5_primaria.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/ifrAjii/asanas_de_yoga_definition.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/domesumodibekuxon.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/mhfgeX0/20193955161.pdfIn PDF document text
    • http://boforobevuziko.mywebcommunity.org/antigone_jean_anouilh_deutsch.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuweduti/iaoih5Q/2978433547.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/gfjjvic/ordinal_data_level.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/asidosis_metabolik.pdfIn PDF document text
    • https://wedufejaf.weebly.com/uploads/1/3/4/0/134018106/bawuvurimuvemolib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_605208c823e11.pdfIn PDF document text
    • https://seritixatot.weebly.com/uploads/1/3/1/0/131070849/5412112.pdfIn PDF document text
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/vofalasonele_daboxasiwu.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/lutoweb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_43dcb83424a94b419b26891b2ee7e0a7.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_c7469ec52f7c41129979386666c44843.pdf?index=trueIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_b3157b1a0b7d4f2ea1c8b97773f0b74a.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14668 6156 bytes
SHA-256: 6f390cc0a9c05c3c7cbdf67276cc8adad9ca276b822d49c6687efdca3734a8e4
font_01_sfnt_off00015b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B76 5264 bytes
SHA-256: ef5b24dff5b6989df1108c365daa7c6cbd3ac866d0841d1c34673d681230a048
font_02_sfnt_off00016d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D47 2140 bytes
SHA-256: a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b
font_03_sfnt_off0001771f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1771F 12224 bytes
SHA-256: 3d55d3a87844fdb68a80db183129bb9b68832ff4313668d5ebfc58fe21e76e0d