Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18b995b49dabbe1…

MALICIOUS

PDF

89.5 KB Created: 2021-04-04 05:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2f3d9533a739521567e09ef3cee0fa41 SHA-1: 53cd2e2d85750c27fef5c72d53fa28575a118547 SHA-256: d18b995b49dabbe13a3a46170af374006f821338ae39c9c3c691da4cc812bc13
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 0.9993

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://crophysi.ru/strik?utm_term=mortal+instruments+city+of+bones+book+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416806/normal_6063e2a0e189e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449771/normal_5fcf445a310dc.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/bilge_oil_water_separator_project.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/which_period_is_considered_as_second_stage_of_industrial_revolution.pdfIn PDF document text
    • http://bepifukikuku.mygamesonline.org/ncert_biology_textbook_class_12_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465705/normal_604ae49f4cd00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_6059b92283256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_6021448067f89.pdfIn PDF document text
    • http://nipawifaxupus.mygamesonline.org/5500878142.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/lamorej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_602d6371605ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389804/normal_6054fe584d3a9.pdfIn PDF document text
    • http://gojovujewinunuj.mygamesonline.org/knowledge_encyclopedia_book_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_600d99f0756f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_601369e8cd2ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_602c5fd64fb10.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/78279474-205d-469b-a945-f230c68e392f/what_kind_of_usb_cable_do_i_need_to_connect_my_garmin_gps_to_a_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4603badb-cdf9-4217-8ae9-1cf74cc332ae/hypnerotomachia_poliphili_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129d1269-f5db-406b-b8bd-98276650e679/prepositional_phrase_worksheets_with_answers.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/jufadomefinaxifozumenami.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/sowuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e4a70f-9cca-4623-9224-6d816c911e80/27117882510.pdfIn PDF document text
    • http://kegigija.atwebpages.com/venutopajisapezanijalabi.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_off00011b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6E 5492 bytes
SHA-256: 4b953c1d9b6b0a42bcc050c10055cdcb262b1e330e12fcd8847e46ad54d01ebd
font_01_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 11884 bytes
SHA-256: 11b891dfa85fa59109303f7e994ab9b98cf3dbde55dab1057fb619cabe7d96f2