Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ee5801fd7fa97d…

MALICIOUS

PDF

78.7 KB Created: 2021-03-15 16:14:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea780dc267905faa82996c52ae3d639d SHA-1: 71ffe772a57d43520eb10bf910ffe47525f9e533 SHA-256: c3ee5801fd7fa97d5f86cc757eb1e835450c8a7d46f1bc32230d94535ba671a3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The document's content is obfuscated, but the presence of external links and the heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=2000+calorie+diet+chart+indian
    • https://funexoxep.weebly.com/uploads/1/3/2/3/132303151/lazakowaxewo.pdf
    • https://jusatupu.weebly.com/uploads/1/3/4/6/134652681/karotute.pdf
    • https://cdn-cms.f-static.net/uploads/4391903/normal_601a2ec9791d9.pdf
    • https://cdn.sqhk.co/degawatoze/gcjf4hf/sopolemagiwabelixotesu.pdf
    • https://cdn.sqhk.co/goluxewimabu/PpGZ9ia/carlcare_price_list.pdf
    • https://cdn.sqhk.co/konajera/91CjgIe/twitter_bootstrap_login_page.pdf
    • http://jumbochecker.com/27786313803znf3y.pdf
    • http://euroshopme.site/zefugidavadimabarezipixo47mnu.pdf
    • http://makamar.tech/manual_crowd_pummeler_how_to_get_chargesrgsw1.pdf
    • http://my-credit.info/dorobot8o0g8.pdf
    • http://interbank.link/buselitixnaq2.pdf
    • https://cdn-cms.f-static.net/uploads/4443326/normal_600d8c857fbf3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_9077526bc9f740bb970b7156536c19ad.pdf?index=true
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_36fa9c21f586450ba0155baa89bab137.pdf?index=true
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_c1aa92c75d9c42ec92913fb3d800ea5e.pdf?index=true
    • https://acaa17bf-cf2e-4132-a9e9-810271eb8bc4.filesusr.com/ugd/ab5b4c_95d34d07110c46abb9c05dab633842d7.pdf?index=true
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_a44f56344f484e69a5119ae20af81fd9.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38b.bin
e9e604c002eeb34de07e83417920beb9bd3d428d88357206edb1ae73fb1cf9d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 5028 bytes
font_01_sfnt_off00010492.bin
c0f72fa602b778b70efa6dd724af42a92ab7bbc0f5565dc3edffb395090a6c13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 11644 bytes

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