Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb4ee06b61c6ba1…

MALICIOUS

PDF

80.9 KB Created: 2021-03-14 12:00:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d8b91c7f201eba29ed2d1488a09a1b14 SHA-1: 1687cdc03e6dd90d20a63b588c39607ea649bbf6 SHA-256: edb4ee06b61c6ba11c6e825227e7f7ee9d5e55a1f2cfb482db7ac7cc0338cfd3
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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=prisoners+of+geography+book+pdf+download PDF link annotation
    • http://junumidutuzakox.getenjoyment.net/mixikedejaposagerowumoz.pdfIn PDF document text
    • https://tidatulo.weebly.com/uploads/1/3/2/8/132815220/4353cad.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/pdf_file_size_reduce_online_upto_100_kb.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/robudidoguviw-kamofited-wojow-dapari.pdfIn PDF document text
    • https://rudadikisoma.weebly.com/uploads/1/3/1/6/131606677/8789934.pdfIn PDF document text
    • https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/noteriwemurefob_daxuv_jadumadat_jebenalewa.pdfIn PDF document text
    • http://rolorutebu.sportsontheweb.net/18192607536.pdfIn PDF document text
    • http://naxuvazexipok.sportsontheweb.net/wozajomu.pdfIn PDF document text
    • https://pekavodasusoku.weebly.com/uploads/1/3/5/9/135982803/lelekonari.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_d51bc8b0bcb4469db73284674b41ec3b.pdf?index=trueIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_9c9143bdb6ff47839f4d87167ab58302.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e38aa33-b50a-46a7-b31c-5df518bb2940/99205104093.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/ctet_question_paper_with_answer_key_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/champagne_pink_formal_dress.pdfIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_a3224ac1a4af4141b15ffa29a10af40f.pdf?index=trueIn PDF document text
    • http://tuwutexo.onlinewebshop.net/application_for_schengen_visa_belgium.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_a90add41ec48484ab773c27bbf41fb03.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/dilegolawiwoniko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ed375d-9316-4dd3-b190-870403e1ebaa/how_to_install_a_clock_movement_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4355e9-627d-44c9-87f3-e36cff1a0b54/history_of_sexuality_volume_2_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/texas_sheet_cake_recipe_no_sour_cream.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_47590b72f579430291cd553e1c679ff6.pdf?index=trueIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/abnormal_psychology_6th_edition_susanna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/234b276b-f635-4fb2-9859-cdc6767a4a18/99481292561.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_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 5700 bytes
SHA-256: ea03bef3ef8483b1a3b8b889fd299a48388605f19385c24048a8ce983c3a1448
font_01_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 11104 bytes
SHA-256: 894124bc142213513d39d5e79912e4a17d3f25174222b55daa73aef012bfb4a5