Malicious PDF — malware analysis report

Static analysis result for SHA-256 f107af75635bbd8a…

MALICIOUS

PDF

79.6 KB Created: 2021-04-06 15:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7c29b1176e6ce8086f5a041939c892a7 SHA-1: 5a2d6234d05a015ca5768ae2cdb13566e1105cfb SHA-256: f107af75635bbd8a58c753b19c90deddc23787420b4f2983d749c273fb8b69d9
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 0.9990

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://dafemum.ru/award?keyword=entrepreneur+magazine+september+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422134/normal_600fb65bdf41c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_606940ccd5a78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_60161ca3d179c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491152/normal_601a9b68ea839.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/gg4qtEr/sadapexupolikikeru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421335/normal_6041a6a21128e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448750/normal_600bca86a32c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479679/normal_6051b07e6496f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479474/normal_600b43eb0b145.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/h2mz1gd/full_planetary_alignment_dates.pdfIn PDF document text
    • http://monofijejawajo.iblogger.org/across_the_bridge_novel_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://peregal.epizy.com/allama_iqbal_open_university_admission_form_2020.pdfIn PDF document text
    • http://xozekenegizag.epizy.com/43690433066.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/61655769910.pdfIn PDF document text
    • http://dexidije.epizy.com/66354038164.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/38653382112.pdfIn PDF document text
    • http://bulexaresozo.rf.gd/25333392885.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/nudixinaxezogaf.pdfIn PDF document text
    • http://najirukijo.rf.gd/ceftriaxona_vademecum.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/safunodinaxamavuduxawunip.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/47743292841.pdfIn PDF document text
    • http://rimejaje.epizy.com/nijebirokemoluratodol.pdfIn PDF document text
    • http://feliruxitekul.epizy.com/53065120959.pdfIn PDF document text
    • http://jamurujitexezi.epizy.com/fusol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 5524 bytes
SHA-256: a5ee84b1858e997da512fa801264155dbecaf7eb70ed9961e21ed5fcf68cc49d
font_01_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 11452 bytes
SHA-256: 2e8d29b9e4c6576d7dfe5c261e7d3803d86a5b183b83e7247e4d1569ec6c666f
font_02_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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