Malicious PDF — malware analysis report

Static analysis result for SHA-256 184059e20f4bfc1e…

MALICIOUS

PDF

79.2 KB Created: 2021-03-23 06:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 94a839ce34e90b9f0f2ff20286094618 SHA-1: 65af141eec79035da69b9dea067b90a8ff7e7084 SHA-256: 184059e20f4bfc1ecedeefde07f075308f73b2f79667ecbfb2da823c86805f08
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=what+is+the+age+of+the+12+apostles PDF link annotation
    • http://lidifit.iblogger.org/maths_formula_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/7MdXihb/faxosiw.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/jdhcGjd/smash_mouth_all_star_release_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410431/normal_6000277c0a41d.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/aha5Xgi/6259136437.pdfIn PDF document text
    • https://fiziwiminika.weebly.com/uploads/1/3/4/6/134686918/xorur.pdfIn PDF document text
    • https://mizinunebij.weebly.com/uploads/1/3/4/6/134660950/5914055.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/3ee17444dbc80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368222/normal_5fcb01d1687e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1436ddc5-857b-41a0-84fa-5dd053d18a87/omoton_ultra-slim_bluetooth_keyboard_for_galaxy_tab_s5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e715cde1-4d8c-4e37-b5bf-f884fc76a24a/best_choke_tubes_for_stoeger_m3500.pdfIn PDF document text
    • http://janalusexisowa.epizy.com/vagowipilifogomufopup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea3d5f5-9a3f-488d-a2bf-a2e86a44c6df/dazubapixadikesoboxa.pdfIn PDF document text
    • http://mutifitiwexo.epizy.com/diagnostico_de_anemia_gestacional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c36895c-0ee7-416c-b9a4-51276dd5b477/questions_you_will_be_asked_in_a_police_interview.pdfIn PDF document text
    • http://vuguwasesa.epizy.com/5784015737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26a08e4-e84f-428e-8312-5444639cf268/how_to_master_the_art_of_selling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9288b8-8f9a-4d0b-a53f-c25e45e7c4bd/what_does_it_mean_to_be_a_martha.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/695e3678-4dd7-45fb-a8f6-bb289701ae90/tilevitojawam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668e17f8-e7d9-436e-a2ca-0514ce815573/pubatojenezixaruw.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_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 5264 bytes
SHA-256: 4927f1e270bbfc480e2e2d6cb5f2cab07cee9e84192a5f8bd86b048661498f98
font_01_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 10708 bytes
SHA-256: d6cc6dd72e93d502285907b817699cabd16ac5090baf48148e76a033568e5b66

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