Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3954a80f31986bf…

MALICIOUS

PDF

97.1 KB Created: 2021-03-28 23:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2787a3a4b8a9e72ffdd4d5924868a1bc SHA-1: 11e92bf860e296700bbbc9867bbdb9585325dd36 SHA-256: d3954a80f31986bfd8b1ddf13948c6abe8e77fa11890e4d4f1e9b3de21e2a579
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 0.9996

Heuristics 6

  • 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 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://resalured.ru/wix?keyword=the+devil+and+tom+walker+en+espa%25C3%25B1ol+pdf PDF link annotation
    • https://gidelusibi.weebly.com/uploads/1/3/4/0/134040719/ba8985efb2fc.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/eje7Fhe/pulse_pressure_diastolic_equation.pdfIn PDF document text
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/numawavegitizarat.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/Gw0gdhf/stickman_superhero_mod_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_601fd3ad29acd.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/dECSfQU/my_little_pony_princess_twilight_sparkle_toy_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422876/normal_6056d71af01c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453914/normal_5fdf7f4e5a67f.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/xeDiehe/emergency_call_button_android.pdfIn PDF document text
    • https://tataberoxem.weebly.com/uploads/1/3/0/8/130874397/536052.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/52hkVhd/57582586144.pdfIn PDF document text
    • https://cdn.sqhk.co/sarodeduz/60gd2X7/wheel_of_fortune_google_slides_template.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/jgcshcr/zopezavegana.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/ijdIhIF/99426364149.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/IggheFM/c_using_alias_template_class.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421937/normal_5fd2a2d06b55b.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/7413103.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/mozilla_web_browser_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/air_force_portal_cac_login_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/natedukudegi.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/free_nda_template_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/what_is_the_point_of_mercutios_queen_mab_speech.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_off00013ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE3 5656 bytes
SHA-256: 22984527ef68f9defc66fa13e8481191bbd876966ebdd006f94613a2c8655fd7
font_01_sfnt_off00014dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC7 11968 bytes
SHA-256: 0441e64911091e665a8e618a91b938b49a60020159470025eb7f7b328d4fb4ca

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