Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb9acfe14d2d5df…

MALICIOUS

PDF

74.0 KB Created: 2021-03-01 15:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 30b0d0dbf686d1b7c64dff03564475f2 SHA-1: d70a09c71219d2d5bec11b1dd7414ef8d4fbf9d4 SHA-256: 4cb9acfe14d2d5df0d5aa6e8f3eee53891f7fda5f48ff2898d9c48135cdf8b52
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/123?utm_term=how+to+use+ariston+washing+machine+armf125 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450351/normal_601bb95760f94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426085/normal_601de7e92623e.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/xibetubolatil.pdfIn PDF document text
    • http://zowuzigokov.22web.org/vubupasojaxaridubejexetu.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/best_tablet_to_read_books_in_india.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/how_did_9_11_affect_the_us.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/ohf9ieo/gravity_ball_game_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_602e35bc49373.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/kevelujewebozusapupefixo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sigukig.rf.gd/65414613380.pdfIn PDF document text
    • http://tepoguko.epizy.com/dasogoxonerifukimav.pdfIn PDF document text
    • http://nadinuvuxogi.epizy.com/mefamudak.pdfIn PDF document text
    • http://mudotepejix.epizy.com/kafusumagevabimo.pdfIn PDF document text
    • http://letituxis.epizy.com/html_checkbox_form_name.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_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 5624 bytes
SHA-256: cc7aef4ff655459c2b8febd0662b28b4fd73d662a2ac63d0ad5ac168f1031b67
font_01_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 10692 bytes
SHA-256: e184d9efb8dfaa31b5578b356730d0cba2c873ea36463f009fdd27deb99bfe7d

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