Malicious PDF — malware analysis report

Static analysis result for SHA-256 faadf2265771de62…

MALICIOUS

PDF

81.4 KB Created: 2021-03-13 14:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8c4e1518da8963f2fd0a06a824db7f54 SHA-1: 9feeb295b988e701a953b1bfd01f04083f661605 SHA-256: faadf2265771de62498af6836f9ea324ebdf20f3a73c0778cf0af75379465589
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://midufefew.ru/strik?utm_term=livros+em+ingles+infantil+pdf PDF link annotation
    • http://torixobo.mypressonline.com/berta_isla_libro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418755/normal_5fcde04a90a3e.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/51281807436.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/zgezBji/64238851808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_6031e30918b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_602d252923b31.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/ZesX8jb/24199308662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_6020aa9fc2d05.pdfIn PDF document text
    • https://miwebuzoz.weebly.com/uploads/1/3/4/0/134095964/c4ffcb5087b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474220/normal_602d46c00eaae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471686/normal_602ff59d1bff7.pdfIn PDF document text
    • https://bemezonef.weebly.com/uploads/1/3/5/3/135389856/9325303.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mimegovo.epizy.com/imperialism_in_latin_america_answers.pdfIn PDF document text
    • http://merixokove.rf.gd/guxoxuvafevuru.pdfIn PDF document text
    • http://kuwexugebukutim.rf.gd/sears_rototiller_rear_tine.pdfIn PDF document text
    • http://sudenajoji.rf.gd/resumen_de_la_obra_20_poemas_de_amor_y_una_cancin_desesperada.pdfIn PDF document text
    • http://webataj.epizy.com/reflected_in_you_sylvia_day.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/96458060119.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 5364 bytes
SHA-256: f52e9e2572e3bb83e181e509c7bef9bf1e5de0db0d6c581f6cd1fc51c20fc07f
font_01_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 12632 bytes
SHA-256: 7440f2769bcaeabe859b5f83eadf3a69fcae7ed183e881c2fd4bb7687a96a39e

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