Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75488415b18bc66…

MALICIOUS

PDF

85.5 KB Created: 2021-03-24 08:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 38a36aa3f1d6ce047eac66439f954fa0 SHA-1: 1335c9251f1c6011918bfc3abbb2f5f48c6d80fc SHA-256: e75488415b18bc6675e024c35858bf332241954a66bf122ccc4abf66c9f4b128
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 0.9955

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://jumiwimov.ru/strik?utm_term=casio+illuminator+gold+calculator+watch PDF link annotation
    • http://widonatozeg.mypressonline.com/93968552938.pdfIn PDF document text
    • http://wersita.fun/fubuvetugefi8dpg3.pdfIn PDF document text
    • http://fagogit.sportsontheweb.net/urdu_books_free_download_blogspot.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/30909643228.pdfIn PDF document text
    • http://instasurprise.online/boy_scout_popcorn_2020_prizes7epkv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486042/normal_5fe4f41b7015b.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/diccionario_biblico_completo_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482623/normal_602b0f5e7b34a.pdfIn PDF document text
    • http://lotto-investclub.com/248483594278mnvj.pdfIn PDF document text
    • http://picply.ru/how_to_write_a_spanish_sentence2es8r.pdfIn PDF document text
    • http://magnitoli-2ekran.site/mibukavarlml4.pdfIn PDF document text
    • http://easycreditscore.info/36747338954f7hg7.pdfIn PDF document text
    • http://bcipreactivaperu.com/jepotirizugajabuwamanekxf.pdfIn PDF document text
    • http://wabiferofuvud.mygamesonline.org/nupatosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483361/normal_5fd1c4b96e74c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471704/normal_600656c1a3bd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_600a1189937c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_229f87968f2545d28d308e86c0bb9f03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26711b52-42a0-4419-8672-08a494366d8c/entrepreneurship_final_exam_questions_and_answers_2018.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_168a032c5059452a9c61b0a96f3daaff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d1316f0-ea2b-4c89-9c00-f741004f2953/37943972728.pdfIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_b8ff3f87523d40b092e3651db12fcc1a.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_8f13cb7e11cc4e07abd09022380da425.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d148ac79-40e7-4285-8b57-a28c13d89ade/womap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052f33dc-68c0-441a-9b65-3f8951c10643/excel_vba_programming_for_dummies_for_dummies_computer_tech_5th_edition.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_3cc2f2f779b54944bdeaf25aee1d4db3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 7188 bytes
SHA-256: 87a1917a8600f666916998720333426d5861edab48ece97c44e8af42526c270a
font_01_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 5348 bytes
SHA-256: a55160b9c7da2c99b872033ea014453a0fce4199ebfa9a57dcc029f5477b5107
font_02_sfnt_off000121ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EA 11224 bytes
SHA-256: 0cc90d6467c892c421ecb37e16ebff2b892603eedb7069c94bb0df0d3906ecc1