Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bfdc7818089216…

MALICIOUS

PDF

76.6 KB Created: 2021-03-30 08:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e2e43d49aefa50e211fe509e9790f960 SHA-1: 2bbfc80d4202770c838ea9fe02db67e5369a1ba7 SHA-256: 64bfdc7818089216cd4fec4d255cd975f7dbd716f5553ec1d903f2502f2993f2
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is weaponized to host numerous external links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=drinkwell+platinum+filter+direction In PDF document text
    • http://zujuzerawijuk.medianewsonline.com/algorithm_analysis_and_design.pdfIn PDF document text
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/855a13c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_5fdc55fa94867.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/hcV3ifk/pozofi.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/77496532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_601c7b6e21aa5.pdfIn PDF document text
    • https://xutawolovunoka.weebly.com/uploads/1/3/0/7/130739399/dadefubura_nusifazugu_weriduv_lunijulozabaxuw.pdfIn PDF document text
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/00b6d4.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/9jeJgjh/35800044874.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/what_is_fried_green_tomatoes_about.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370985/normal_6007c85da490d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_605c2a9c26e50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_b658e947deb344f7b39d4dfc130c0301.pdf?index=trueIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_2be47efc6bb945ada923d151731eb5ae.pdf?index=trueIn PDF document text
    • https://034b020c-baab-45d1-b3ff-c950d21f9178.filesusr.com/ugd/3c93bc_1f9a8b0b043d4aba98812ac1bf08b498.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_67671ce6eb8543f9b411f94d9423cabc.pdf?index=trueIn PDF document text
    • https://40c507a3-37b7-491f-afd3-f28ba3af1fb2.filesusr.com/ugd/7f5264_00a98335788b497dac30dcaad256c2f6.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_eeac0fa239fd43b382dc51c2a9970e05.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_c0b6d3fdc3774d65976c2e64d2b8916b.pdf?index=trueIn PDF document text
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_aa9bc75dd5074484a0809a74215d4287.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_91514e7b71b2421393f99cfccb518451.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 4176 bytes
SHA-256: 086dbd3fbaa8b89218d028572f43371466023f4cd88f6f031a10dc48b48dc4a5
font_01_sfnt_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 5280 bytes
SHA-256: 597b633f920926a57d5263ef38133e696c9d3185466bccc90187f9ac7c145453
font_02_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 11264 bytes
SHA-256: 8c43c0781f620c04ca75a89d0e6d578709034f64156321dcb1e4c84850e209c3

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