Malicious PDF — malware analysis report

Static analysis result for SHA-256 f337b098c72d953c…

MALICIOUS

PDF

81.8 KB Created: 2021-02-18 14:35:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e6408433815921ca1fb62f488f41f027 SHA-1: 516e77ad6a3a4f15688384f054a6698075405fbf SHA-256: f337b098c72d953c1019caa2d0a6b65499ec46ce249ccdd661a3bbe0ac8851ca
126 Risk Score

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://bologen.ru/strik?utm_term=monday+morning+leadership+david+cottrell+pdf PDF link annotation
    • http://skameyki.club/manualidades_con_botellas_de_cristal9q7fl.pdfIn PDF document text
    • https://falojixij.weebly.com/uploads/1/3/4/8/134878909/dikizugagavi.pdfIn PDF document text
    • http://mazafaka69pussy.online/90136668452hgfwk.pdfIn PDF document text
    • http://lazerepil.site/training_and_development_plan_template_free4nknp.pdfIn PDF document text
    • https://vatipevik.weebly.com/uploads/1/3/1/4/131407386/zuxulofa.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/zisilevoxas.pdfIn PDF document text
    • http://indital.fun/28620171488ejkda.pdfIn PDF document text
    • http://shmelev.pro/479343942580gfp6.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesumor/JX1hdr8/toggle_free_meaning_in_urdu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://felubumasosazi.epizy.com/51488875411.pdfIn PDF document text
    • http://gurimufibefuw.rf.gd/95938775496.pdfIn PDF document text
    • http://bubaxomunuf.rf.gd/whats_another_word_for_groups.pdfIn PDF document text
    • http://wubidizox.rf.gd/dagexazuxuvedelasoduzida.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 6548 bytes
SHA-256: 370b63e99b3bc2c1d8b7a2bfc1693e0257dccade0e64e814f912f9e1c3af29e8
font_01_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 5736 bytes
SHA-256: 34b659efeaa6a2a9bf5daaa015eb4954f51132b96e589da01a94397c154a4d85
font_02_sfnt_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 10632 bytes
SHA-256: ece6be4a1f9bda467a6e00f8122aa9e09276b10e69b9e8e4248555518f698ddf