Malicious PDF — malware analysis report

Static analysis result for SHA-256 62fbef087c8fed5f…

MALICIOUS

PDF

76.7 KB Created: 2021-03-26 08:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c967d720fbed2cf9f1ee9e42a3ccb563 SHA-1: 92119555e0bb48837353bb77f771eed94d034e0d SHA-256: 62fbef087c8fed5fd7b40fbac3216fcbf41201fd28119230976744c040d48cd0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to inflate search engine rankings. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the primary goal is to redirect users to potentially malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=garry%2527s+mod+portable
    • https://static.s123-cdn-static.com/uploads/4456685/normal_600562d1d3665.pdf
    • https://cdn-cms.f-static.net/uploads/4409096/normal_6051029ff142c.pdf
    • http://es50off.pro/sharing_a_business_page_on_facebookw3ugc.pdf
    • http://nakekizedexu.getenjoyment.net/do_you_capitalize_the_word_father.pdf
    • http://rekijiwowak.scienceontheweb.net/simmons_prosport_600_rangefinder.pdf
    • http://montana-media.com/4550561521i1y1y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_6f9514a8965a4fb49506bdf30891e70e.pdf?index=true
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_4b9f352ff3ee47758e93d5a30db4d9d9.pdf?index=true
    • https://s3.amazonaws.com/womirofop/teganevuxanowuta.pdf
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_710e723dc4c44d69be78040707f7e95e.pdf?index=true
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_a2e06b97daa845f18bc24f588fce979d.pdf?index=true
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_63b90d2a80b54f3ca58c3031ad834156.pdf?index=true
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_d959b80732ee4c678ab354faa6a2f7d9.pdf?index=true
    • https://s3.amazonaws.com/goviwigax/ebay_app_ios.pdf
    • 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_off0000eb20.bin
875b0bfd13eefe6fe9323129e81c163e89d30ef48f0fabdf790c82e92ddfa77f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 5412 bytes
font_01_sfnt_off0000fd79.bin
81d4d8d36e3de1d04dbcb62a7ee5d11d8634eb27b527ada6b7725e17ce0898ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 12428 bytes