Malicious PDF — malware analysis report

Static analysis result for SHA-256 994ceaf9ce08fc33…

MALICIOUS

PDF

79.4 KB Created: 2021-03-05 12:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7a1b7f631751ba3f4d5adfbfb9e0b923 SHA-1: 27371164a34787626656def36a609fbe2dc8712c SHA-256: 994ceaf9ce08fc336e09b84f9071c56466428c8c5cb5d435c599ea40c8acd7aa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting an attempt to manipulate search results or distribute malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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://fokemale.ru/wix?keyword=manual+cuisinart+ice-30bc+en+espa%25C3%25B1ol PDF link annotation
    • http://tunewejewuz.mypressonline.com/software_innova_3160_brake_bleed.pdfIn PDF document text
    • http://anyita.space/459289271269701v.pdfIn PDF document text
    • http://verifybadgesbusiness.com/modern_warfare_servers_are_badb76e7.pdfIn PDF document text
    • http://luminar3-download.xyz/8836706155ygvbs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412159/normal_5feefac8414b9.pdfIn PDF document text
    • http://hotita.fun/musogowewilajixab3v09e.pdfIn PDF document text
    • http://neip-forum.fun/47663686254aa4go.pdfIn PDF document text
    • http://nanolenka.xyz/sagudeximajodulaputubob1p717.pdfIn PDF document text
    • http://voirly.xyz/totufobikojuwukevibigoxouygup.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/HWhhmje/huey_p_long_bridge_run_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_601cab4441456.pdfIn PDF document text
    • http://1xbet-registrat.site/tbd_channel_failarmyimo7i.pdfIn PDF document text
    • http://devgm.design/zusaropadamitepn6ngz.pdfIn PDF document text
    • http://theporte.xyz/63642299813jrxpq.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/59664704243.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/egehaL7/mobefivigitobaronizuluvab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gakilasefit.myartsonline.com/the_wave_todd_strasser_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/tibelosojerune.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/whatsapp_status_malayalam_free.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/71389048392.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_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 5620 bytes
SHA-256: b6c1ee288cdef09ee39388232031f520d435916f91e4c39fc8c90e7ac9970e53
font_01_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 10364 bytes
SHA-256: 683253c4eb52c9c968246ec91246bb8eb3b417dde729a6751b7062eafeeff167

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