Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d21a8445dfeb5a…

MALICIOUS

PDF

78.0 KB Created: 2021-02-06 20:35:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 51aabcf9fe9300feb267feb6c5efbb04 SHA-1: b0dbdd7465914d710c5a385838ead4f8b58bce15 SHA-256: e8d21a8445dfeb5a1765b4b46f71bed5cf6f149ead7ff6ac6dfd824cfc833273
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'Video cutter app for pc', suggesting a lure to trick users into visiting the malicious URLs.

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://crophysi.ru/aws?utm_term=video+cutter+app+for+pc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456398/normal_5ff1b38c182de.pdfIn PDF document text
    • http://abouts.space/vojolisexikizip73arv.pdfIn PDF document text
    • http://istlan.space/metixanufifelavufaz5g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_6019a5385c124.pdfIn PDF document text
    • http://craftsmansmetics.com/computer_dos_commandskfdtu.pdfIn PDF document text
    • http://samozanyat.info/refewabamebixitaketalixut16wb2.pdfIn PDF document text
    • http://doordash.fun/first_aid_psychiatry_5th_edition4kuh5.pdfIn PDF document text
    • http://wibemixu.22web.org/xavimemisa.pdfIn PDF document text
    • http://vsedlyatebya.xyz/adjectives_in_russianbzmgo.pdfIn PDF document text
    • http://beautysale.site/plotting_points_4_quadrants_worksheetcrtjy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413120/normal_5fdfcc50d9cd4.pdfIn PDF document text
    • http://helpcenter.business/560049122006klh.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/cs_deals_bot9c0ez.pdfIn PDF document text
    • http://ruzagasaz.iblogger.org/92215330850.pdfIn PDF document text
    • http://buyfastedcircle.xyz/ejercicios_resueltos_transistores_bjksgl2.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://s3.amazonaws.com/zuses/android_studio_buildtypes_debug.pdfIn PDF document text
    • http://nonulalomijowo.epizy.com/79288893362.pdfIn PDF document text
    • http://pudubekij.epizy.com/woolworths_online_application_form.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_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 4680 bytes
SHA-256: 14a1e66879115267ca1cec53e11138fb9338e22884afb35099d89d0f5d07412e
font_01_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 11088 bytes
SHA-256: e4186d50067bad652384169775c070d3bbddd2a752c495677beb4dc91a46b626
font_02_sfnt_off00011c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.