Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c818577a3fb4dae…

MALICIOUS

PDF

90.5 KB Created: 2021-03-20 06:48:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 16720f6376d13cf6de80c99f7814c43f SHA-1: 3d47ee61dc6e55e22ab0dc548aacb1a120c981be SHA-256: 8c818577a3fb4dae14eff4ed44295bff3166870b6eb68d48f2e717c3db46b975
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 0.9994

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://maypoin.ru/award?keyword=excel+vlookup+example+different+sheet+pdf PDF link annotation
    • http://jemulobapamiwu.mywebcommunity.org/40979379637.pdfIn PDF document text
    • http://watercart.ru/najipusipizosazefowutuvo42pyu.pdfIn PDF document text
    • http://romeoplanet.club/vevizevirodujivorexoxenx32c.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/gf97hjE/fear_the_walking_dead_season_2_soundtrack.pdfIn PDF document text
    • http://koprovk.xyz/survival_notes_last_day_on_earth975y9.pdfIn PDF document text
    • http://arendaavto.taxi/vizolorametilisafovuboti6vvho.pdfIn PDF document text
    • http://medicalpracticementor.com/gmail_email_template_htmlhgbeo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_604f84bc5b678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465264/normal_6018316b8944a.pdfIn PDF document text
    • http://realnoe-obshenie.online/sql_queries_examples_with_answers88858.pdfIn PDF document text
    • http://hangookoil.ru/roderuposomizugemuwiaikh.pdfIn PDF document text
    • http://mijuxub.66ghz.com/exceptional_learners_an_introduction_to_special_education_13th_edition.pdfIn PDF document text
    • http://tiktokhd.design/a_level_physics_practical_noteso58gu.pdfIn PDF document text
    • http://fastpysystem.online/dutebavukokeba7xqda.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/Priehhf/vuxojufawelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_603a86624f318.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/gxgjPdA/nasal_polyps_surgery_types.pdfIn PDF document text
    • http://gratoramaa.space/winodegopejhphr5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478968/normal_6055319778724.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/77956278319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_604b84108692f.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
    • http://rerivumisiso.rf.gd/atresia_y_estenosis_esofagica.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_off00011527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 5428 bytes
SHA-256: e912fde5be39e32363271d65d365e15553f4f4387a953927e78eb608850daeee
font_01_sfnt_off00012770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 11284 bytes
SHA-256: 12607b235e154aa3f52b66a12d26c9718243e967ac7db76ef37dd5b252ab154f
font_02_sfnt_off00014dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFD 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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