Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77af7fb87a5a377…

MALICIOUS

PDF

79.6 KB Created: 2021-06-09 17:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bc0378004ef129553cf60c9863244a94 SHA-1: eedd2b35011ae31a3a4609c6b24cbbd29db9d1ff SHA-256: e77af7fb87a5a377aed17683c025172be0ee2aaf55a3049d7e85edbd50ff9fc3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=granny+mod+menu+1.+6.+1+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379473/normal_5fe4471cf036b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_605fef3bafa4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_6013787441f50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427526/normal_60335be38d242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_5fe7061121ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_6036c946455b0.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/e6f006f0-9de2-4bf9-8071-9f149f2d60cc/voxubukul.pdfIn PDF document text
    • http://liguduper.pbworks.com/w/file/fetch/144575571/17113945676.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144627051/lerekexesomabiwebuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea145e3-469b-42ed-b794-6764e59d4a5f/luces_de_bohemia_resumen_rincon_del_vago.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/37205160018.pdfIn PDF document text
    • http://sikawejedi.pbworks.com/w/file/fetch/144628278/13485500916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f0b5b2-d207-4b49-bbc7-77db2e2ca644/nutrition_arbys_classic_roast_beef_sandwich.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144647145/figovisewexewikunur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796ae9cb-a563-465a-b40b-430188576134/current_immunization_schedule_in_nigeria_2020.pdfIn PDF document text
    • http://vomuseteweto.pbworks.com/f/lgred_mini_split_reviews.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/f/how_to_download__install_fabric_mods_in_minecraft_1.16.4.pdfIn PDF document text
    • http://maxasol.pbworks.com/w/file/fetch/144684993/how_long_does_a_laparoscopic_colectomy_take.pdfIn PDF document text
    • http://xifatarege.pbworks.com/w/file/fetch/144549708/xofuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c260eed-9f25-4ad3-889c-1a51156ecade/5915095277.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_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 5332 bytes
SHA-256: 5c1aedf8c1927340db1b26d59011658aa0ecb71b4e4b0b97ad4a6ef74616c2fa
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 22152 bytes
SHA-256: 34acf15e82c8e9d34c15e3ba96aa07ee9c84976bde457d6108ac4a0fe5db4698

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