Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7a96d0498ef27b…

MALICIOUS

PDF

84.2 KB Created: 2021-04-07 06:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c938a1f6e533c476dd5c5ae01ce0d50f SHA-1: 972b979f2377ebb87c7a65fc7fb5036244879b5c SHA-256: ab7a96d0498ef27b73acad9bada36d8e9750496cac4338313d5e39e296bf8ae6
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://jacksth.ru/123?utm_term=cassiopeia+combo+guide PDF link annotation
    • http://custits.space/fonopuranetuwinio72dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_601fa029cdf0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_6028b267af61f.pdfIn PDF document text
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/efa5f.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/3621594.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/myanmar_tourism_statistics_2020tlrmn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_602810f7c89bd.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/36206681275jf9in.pdfIn PDF document text
    • https://kiniwotonupit.weebly.com/uploads/1/3/0/7/130776343/bimegepadupulu-piwinumit-dofewepixeguwog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_602623ec00797.pdfIn PDF document text
    • https://xilazugalalurid.weebly.com/uploads/1/3/4/6/134685369/3858838.pdfIn PDF document text
    • https://riximuboderex.weebly.com/uploads/1/3/4/7/134744564/482263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_601c886b87f38.pdfIn PDF document text
    • https://julavatevimire.weebly.com/uploads/1/3/4/6/134669339/2182231.pdfIn PDF document text
    • http://helplnstagram-confirm.com/dotugojeki734ut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_6057189ed168d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454824/normal_5ffca4c4e3695.pdfIn PDF document text
    • https://dukidisivaturan.weebly.com/uploads/1/3/5/3/135311912/8c4fc0e25b4f980.pdfIn PDF document text
    • http://voicebftyi.com/what_is_the_definition_of_quality_management_according_to_iso_90003kwwy.pdfIn PDF document text
    • https://suligabewe.weebly.com/uploads/1/3/4/0/134040343/4333621.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 5308 bytes
SHA-256: 7789d79e5e72884b7262eb86d1823cac5027bf3260c86949cd0f43889fa092d0
font_01_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 11688 bytes
SHA-256: abd7fd7569c6098b8904e90b08556c271766608218d8293c4cb6a952235195ef

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