Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b97c9872642d50e…

MALICIOUS

PDF

84.9 KB Created: 2021-02-20 00:23:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 788840ec5a0591f1e69618fd22f0c632 SHA-1: 2198f5e6a33b1612305deb01bfdaec5cb0620362 SHA-256: 3b97c9872642d50ecc1b5d0cb749bf159944711c349c19c7bcd59fdb5a747caf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics further supports this assessment.

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://maypoin.ru/wix?keyword=v+wars+parents+guide+2019 PDF link annotation
    • https://delupizamima.weebly.com/uploads/1/3/4/5/134578079/kusofu.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/75345340025qpfzd.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/banubufinisesuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388156/normal_5ff976f2b928c.pdfIn PDF document text
    • https://pafuxasakilufa.weebly.com/uploads/1/3/5/3/135327400/003226fb7e5.pdfIn PDF document text
    • http://armada.technology/avon_catalogue_september_2019ox04h.pdfIn PDF document text
    • http://tokio-2020.fun/cemal_sreya_gl_iiri_incelemesilhvce.pdfIn PDF document text
    • http://bizbize-yeteriz.org/tupakax39jbx.pdfIn PDF document text
    • http://kosolibanun.iblogger.org/vbscript_date_format_function.pdfIn PDF document text
    • http://myyshooop224.site/abcd_2_movie_video_song_1080pw01cf.pdfIn PDF document text
    • http://coloradocustomelectric.com/warhammer_40k_kill_team_2021npury.pdfIn PDF document text
    • http://coolvdomaion.online/dragonstar_guide_to_the_galaxylxvng.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/jowaro_fufeni.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://wexejobi.rf.gd/27335081373.pdfIn PDF document text
    • http://dadagax.epizy.com/adsense_blogger_template.pdfIn PDF document text
    • http://xenemusexo.epizy.com/85228137296.pdfIn PDF document text
    • http://zazifikas.epizy.com/manuel_antonio_park_guided_tour.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_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 5404 bytes
SHA-256: 9ac75db1a2d31d17aabe09ba066cde56c8578b56d2136dcc2c61454581c69d42
font_01_sfnt_off00011401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11401 10936 bytes
SHA-256: aa5dcd88a4c6f4dbb3034640591d9bc42ae1243018781e4715b9882db30558d9
font_02_sfnt_off0001389d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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