Malicious PDF — malware analysis report

Static analysis result for SHA-256 3805591271f8969c…

MALICIOUS

PDF

83.6 KB Created: 2021-03-19 06:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 72e4d752c93d25288117db183be2eb5d SHA-1: 19bec5e6890a1b747af69c541adabac560d7d87d SHA-256: 3805591271f8969cb51975277411946aef201cd82e24d6945810e47f1caefcea
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 0.9992

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://midufefew.ru/wix?keyword=understanding+health+insurance+chapter+8+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492593/normal_5fc9b9ddefab6.pdfIn PDF document text
    • https://fitarerak.weebly.com/uploads/1/3/5/3/135313257/rudofiwowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422890/normal_5ffa07979cd75.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/1388620.pdfIn PDF document text
    • http://pewagupudasita.22web.org/fawowivag.pdfIn PDF document text
    • http://sifinujox.sportsontheweb.net/61984299827.pdfIn PDF document text
    • http://rineset.xyz/vadiluruzuwo1eu15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409609/normal_6028e471e16f9.pdfIn PDF document text
    • http://pressit.space/45360469555ii30h.pdfIn PDF document text
    • http://garant-ritual.online/tabla_de_integrales_indefinidas_o_inmediatastnobc.pdfIn PDF document text
    • http://kulokozataxat.22web.org/52808129790.pdfIn PDF document text
    • https://sarenudubafuje.weebly.com/uploads/1/3/4/6/134680246/7975007.pdfIn PDF document text
    • http://autobaff.xyz/widefopoxamj86xt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_600e136212f68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412778/normal_60350687d4bb0.pdfIn PDF document text
    • http://bitcoins-profits.com/pezekipec389a.pdfIn PDF document text
    • https://guwasevotimonu.weebly.com/uploads/1/3/2/7/132741081/xegowub-durugaze-jefof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xonifovozub.epizy.com/91628295529.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/moxilifupedeguja.pdfIn PDF document text
    • http://lovusado.epizy.com/marawetanatabojakumax.pdfIn PDF document text
    • http://povokufav.epizy.com/bitabiwuxavirizemumowu.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/brown_vs_board_of_education_effects_on_special_education.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/86948284440.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_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 5776 bytes
SHA-256: 53b41aa5e3353c9970423f872127053bd5209aede7b85e22cc6d3000154f4682
font_01_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 11152 bytes
SHA-256: 94ecb1e18ddb30d265f4cc3203f26270e105d952d994c84c87a451a94ea45525

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