Malicious PDF — malware analysis report

Static analysis result for SHA-256 9807df870b819b15…

MALICIOUS

PDF

119.3 KB Created: 2021-03-19 22:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 546b1099cb3ec7cdea50e070238995c7 SHA-1: 904555018d23a41b90d9b04f098437f059b892e8 SHA-256: 9807df870b819b152a84101151302a7d9b7a486ae3379d6e8c1c6a1f2006a54c
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 0.9998

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://botokaw.ru/award?keyword=bible+prayer+study+course+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368971/normal_605494bfe276a.pdfIn PDF document text
    • https://sozezitevi.weebly.com/uploads/1/3/4/6/134639304/9918464.pdfIn PDF document text
    • https://nasaperexi.weebly.com/uploads/1/3/5/3/135351481/nezarezanawizu_fodip_bovijiz_wopotewaze.pdfIn PDF document text
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/9563969.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/2020_afl_fixture_a4.pdfIn PDF document text
    • http://timinome.getenjoyment.net/xefuzewumulukoniwidunoki.pdfIn PDF document text
    • http://rajeziriga.scienceontheweb.net/bacteriologia_general_evelyn_rodriguez_cavallini.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378386/normal_60054f5802de4.pdfIn PDF document text
    • http://kemamibuke.mygamesonline.org/biw_tool_design.pdfIn PDF document text
    • http://pilinopumewaza.mywebcommunity.org/49999111141.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/hugo_weaving_captain_america_salary.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/bidurudilidujug/lexavalubepomufejogepalu.pdfIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/atmosferas_peter_zumthor_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/819bcec4-1a5a-4731-9678-a489f58ae343/what_does_it_mean_for_a_man_to_be_head_of_the_household.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/weather_report_in_jinan_china.pdfIn PDF document text
    • http://larovitivejel.atwebpages.com/texte_en_anglais_pour_apprendre_a_lire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37979a78-7709-47b1-93f8-806e1f3b0337/page_break_google_docs_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95cda08a-bc3a-4e73-9768-2159e642cdbd/sintomas_agudos_de_trombose_venosa_profunda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6bfce1f-fbec-4e8e-a977-01067eb2b281/verb_preposition_collocations_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125d75f3-0406-4796-9d13-7ebb02f6fa13/wegevusi.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_off000197b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197B6 5532 bytes
SHA-256: 73f92b822989bedbb1341131af0c580565b037290d673b19f9d902aa10abbc08
font_01_sfnt_off0001aaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAAA 10560 bytes
SHA-256: 8278db8c0960e31f34e4c6a4f6f96f0fdf06b2a428eb076670e5db4879f427d8