Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99549a492bc718d…

MALICIOUS

PDF

76.2 KB Created: 2021-04-05 17:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 62ec4ca76394806a55748fc4c652d490 SHA-1: 9aedf69afdabebbe8d2190843a3c1aae8bd96e10 SHA-256: d99549a492bc718d449b5870839bbdfdd186a931de5a2b773c2e821e83ca5dc2
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 0.9997

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://pelibifir.ru/strik?utm_term=the+hiding+place+audiobook+chapter+11 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483072/normal_5fef85089fe95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365584/normal_60011f48553fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_5fe7d8cf3d961.pdfIn PDF document text
    • http://xofiladaf.22web.org/riwowomidowododu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489852/normal_5fc5915ba2239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_60345a36bfa0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481164/normal_6056f789329c8.pdfIn PDF document text
    • http://gukazuz.iblogger.org/application_software_information_in_marathi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_601753be4c304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_603e65a3adda4.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/5e6e9862-40d0-4dbb-8231-a18cb2778a0a/zukaxizuwojes.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/materialize_css_mobile_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/adblock_for_opera_browser.pdfIn PDF document text
    • http://tatetutigu.rf.gd/examples_of_abstracts_written_in_apa_format.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/literacy_worksheets_ks2_year_5.pdfIn PDF document text
    • http://zetajosovalafu.epizy.com/suvibide.pdfIn PDF document text
    • http://zotodim.epizy.com/19571104637.pdfIn PDF document text
    • http://bopoxisi.rf.gd/remington_model_700_adl_vs_sps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d01095-8498-437e-9a89-4e48fee87ef7/how_to_charge_i11_tws_airpods.pdfIn PDF document text
    • http://zitoveruvet.epizy.com/dobiforazego.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/benutof.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_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 5360 bytes
SHA-256: 6eacae7884f607746b520760a4c4057426469c672dd589330bbaf7bbd28f6475
font_01_sfnt_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 10004 bytes
SHA-256: 3bae1277777748452acca6d65ddfdf47822376d0501fb885665e04a0237e8b75

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