Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a7afc70f782610…

MALICIOUS

PDF

81.9 KB Created: 2021-04-01 16:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4ba2b42fc81bca41e2027132d4c60eef SHA-1: 1bf5e20a9c6cc6c355cf27670d572c5d87be0447 SHA-256: a3a7afc70f782610cd7dc5f69d9b0d7e8cce178b997181b07846ee1a4ce27db2
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 detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's purpose is to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=dream+catcher+instructions+printable PDF link annotation
    • http://lejifip.sportsontheweb.net/konosuba_light_novel_download_epub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_605f3c87467f6.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/91857485628.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/80811844262.pdfIn PDF document text
    • https://cdn.sqhk.co/sarafogu/gegg4gh/binatonusinatamagalamabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408706/normal_60174986c2688.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/2500_in_1960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_6064f28671ef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_601d8428255d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5fce76ffc3b5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474205/normal_5fdc71018fa43.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/xtchhhi/84933979460.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/21778569187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388413/normal_5fd3465f1fef4.pdfIn PDF document text
    • http://zarudofafibitov.mywebcommunity.org/xolekewarefuvodulenaganiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456984/normal_5fdfca50a9d26.pdfIn PDF document text
    • http://vofufime.mypressonline.com/veposafanofidivuwuxixozex.pdfIn PDF document text
    • http://bumosid.getenjoyment.net/how_to_fill_water_in_bissell_proheat_2x.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://moxowofabijis.epizy.com/flight_simulator_mac.pdfIn PDF document text
    • http://kedojaji.epizy.com/balerebas.pdfIn PDF document text
    • http://zuluvegutadetu.epizy.com/gta_v_bury_the_hatchet_song.pdfIn PDF document text
    • http://tinejamuwaki.epizy.com/26476287992.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_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 5196 bytes
SHA-256: 5020e471cbfdd1b7a463a3ee1b1ff27a7bce161e6690db6a792336fadcff34fa
font_01_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 10388 bytes
SHA-256: cb8f4b62549690fa8a39ec4c28c1f461ffc04068ae8dbb44b9baafc98e2d36b3
font_02_sfnt_off000129f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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