Malicious PDF — malware analysis report

Static analysis result for SHA-256 136cf7108b072f7b…

MALICIOUS

PDF

82.5 KB Created: 2021-04-21 18:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d3b9a41b4178c038666775e7a7e78c24 SHA-1: 128a79846390265457c20c04895f28f3569e44bd SHA-256: 136cf7108b072f7bdc149492fa972f790ab5fa4e1f3f8104e7ce8c6556ac8527
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-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://pelibifir.ru/strik?utm_term=apc+backup+ups+cs+500+replacement+battery PDF link annotation
    • http://jitimapib.22web.org/easy_star_wars_trivia_questions_and_answers_printable.pdfIn PDF document text
    • http://esclick.pro/790831647875otq3.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/pdf_robotica_para_iniciantes.pdfIn PDF document text
    • http://fullpisetc.ru/understanding_human_communication_13th_edition_by_adler_rodmanbk9qi.pdfIn PDF document text
    • http://vodizurulenega.mypressonline.com/25380840513.pdfIn PDF document text
    • http://rijexofugovu.medianewsonline.com/76643851468.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7d5e2746-b8c4-47fb-b8c2-6d9a0b98b76a/lejigareve.pdfIn PDF document text
    • http://koradanizepagow.myartsonline.com/apprendre_l_espagnol_pour_dbutant.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/personal_branding.pdfIn PDF document text
    • http://xufojeji.epizy.com/66615822666.pdfIn PDF document text
    • http://lezebotetojezaz.epizy.com/dumisiloserevodam.pdfIn PDF document text
    • http://vigejufad.rf.gd/subconscious_mind_power_techniques_in_tamil.pdfIn PDF document text
    • http://davojuke.epizy.com/tovuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce236d3c-e2e2-426a-b622-aa9f3dbaaf91/personajes_mas_importantes_que_participaron_en_la_independencia_de_mexico.pdfIn PDF document text
    • http://pelazem.rf.gd/scrabble_how_many_points_for_using_all_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f02dae-2e84-4280-8084-23a93b2626c8/feposuxinosaxavalapo.pdfIn PDF document text
    • http://kiwizenodemi.epizy.com/video_cutter_and_joiner_free_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5686ed22-f9e4-4dd1-87af-ea99bc3216b9/ewi_5000_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afce0a9f-5a11-4ff3-b2f2-a7ca43bd5b5b/zidejimu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 5364 bytes
SHA-256: b07a67e7337a854ada5a3c4c0a077a3634c5c2ae835407959f1d8b0eaed4ea59
font_01_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 10732 bytes
SHA-256: 21555e280ec2f4f0307595a1186fd5127d372d41e4d09aa7da6594ed02c4254e
font_02_sfnt_off00012e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E46 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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