Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cd9cfb808ce9d6…

MALICIOUS

PDF

81.9 KB Created: 2021-03-16 01:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c630d83afa3a272e8c884978a4b19ce9 SHA-1: 2365b591841a69bca5f7412c435c67b73c3b540c SHA-256: c4cd9cfb808ce9d69d5817d97722c673af0e22a44c6b321b35bdb860e3b6bddd
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-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://jottigo.ru/wix?keyword=eternium+best+class PDF link annotation
    • https://xabogiseduwa.weebly.com/uploads/1/3/4/7/134717421/5ef64eee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5fe72d522382c.pdfIn PDF document text
    • http://lasns.fun/66535306866yymlc.pdfIn PDF document text
    • http://voirly.xyz/707269166965fw3v.pdfIn PDF document text
    • http://perfectiona.online/rci_2950_dx_mods86ehm.pdfIn PDF document text
    • http://thefortykuti.com/dragon_ball_z_comic_books77nuy.pdfIn PDF document text
    • http://mebel-albero.ru/cbt_treatment_plan_sample9og6l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454999/normal_6040d5e226f1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_604194fbc2519.pdfIn PDF document text
    • http://winnerslm.space/mozosodoxajofanu1cxjx.pdfIn PDF document text
    • http://fruit-italy.space/shallow_tabs4khbx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458413/normal_6007fbd991bd5.pdfIn PDF document text
    • https://galinasirisijav.weebly.com/uploads/1/3/5/3/135310000/497104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454046/normal_5feecd4b28649.pdfIn PDF document text
    • http://5coupon.info/73908259055dqoug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_50b0727336374dc9ba7ab674d8b1f5db.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_e4c00d9707924326ab9dba8bebef1039.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/financial_reporting_cpa_course_outline.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_96dd655e21d8493e9dd9399392105692.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/mifofa.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_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 5040 bytes
SHA-256: b469bcc7673b14239ed491c95b5dc6a92ac3025a743d3cd71e402bd7382a13ae
font_01_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 11748 bytes
SHA-256: d2c45b14891be6c364923f86c7475f6492fe93c1aba079d4b309a1838c0db40d

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