Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9d328ad0c2e63b…

MALICIOUS

PDF

86.0 KB Created: 2021-02-17 10:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 608aba8aa4ccad3508a0b0f5cfd5d9a2 SHA-1: a0f0b9313e10f80c16fbb78054ffe6c6f5e9f8e0 SHA-256: 9e9d328ad0c2e63b70c1294a227fd845b6da661dc4304d94f2ade802df23d92c
126 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, with one URL specifically mentioning 'esl writing exercises for beginners pdf' in its query parameters, suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further supporting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=esl+writing+exercises+for+beginners+pdf PDF link annotation
    • http://shoes-storie.club/tivalumanimoselirazwocdn.pdfIn PDF document text
    • https://wulelosen.weebly.com/uploads/1/3/5/9/135992808/rowubidonoro-folot.pdfIn PDF document text
    • http://jolujunutido.iblogger.org/who_viewed_my_ig_instagram_profile_apk.pdfIn PDF document text
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/pamagijagumek.pdfIn PDF document text
    • https://dazuzoboda.weebly.com/uploads/1/3/4/0/134017564/1855689d597c9.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/KP8hjia/31641286655.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/novifik.pdfIn PDF document text
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/rezutadipub-xikeguxepizodu-kogubok-faxojimuju.pdfIn PDF document text
    • https://jiwejezagaxu.weebly.com/uploads/1/3/5/3/135325467/votum_ludobofap.pdfIn PDF document text
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/piwit.pdfIn PDF document text
    • https://jenejipita.weebly.com/uploads/1/3/4/4/134473981/gifuwododotiko-tawuwato-viluxudaluwaf-beten.pdfIn PDF document text
    • http://ig-socialmedia.xyz/xexidugowizusivaminodeliwqk7xb.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/pirosisob/81623875651.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/76880075704.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/bimco_charter_party_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/54935586332.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_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 5156 bytes
SHA-256: 9a45a5f314330e3b54f2cd07ced41f954d59608cfae2d5424ecfd5ac69db669d
font_01_sfnt_off00011893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 10612 bytes
SHA-256: 87d8d2dcbe439bc03d341de6909cf4d0f9217054fd33e3577d545ea62448de43
font_02_sfnt_off00013c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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