Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3447ed6216541b…

MALICIOUS

PDF

81.8 KB Created: 2021-05-13 17:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c497bc2bd490e58664aeaa537bcc5073 SHA-1: 45f31657abd1542d75c221746d26e3c0b8cfa558 SHA-256: 3d3447ed6216541b03c2ec89f83586e067a91e829f02d7fa4aa13eeb8efb8c56
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7877

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/strik?utm_term=is+baby+trend+sit+and+stand+compatible+with+chicco PDF link annotation
    • http://xovijezup.mywebcommunity.org/nujejipibejerifasis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410448/normal_5fe7582573eef.pdfIn PDF document text
    • http://kisuvok.scienceontheweb.net/67931260928.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/8547808225.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5fdf923232aee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408984/normal_5fe5a6f8a8500.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/giidxgj/honda_gx340_motor_oil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_602e7fe8de857.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/hhMghjM/hd_camera_for_android_pro_apk_cracked.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/jjIiac6/new_wallpaper_iphone_ios_13.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/what_is_the_best_free_golf_gps_app_for_apple_watch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408864/normal_6025b5e3bfe6e.pdfIn PDF document text
    • http://nakotigolajeg.scienceontheweb.net/cervical_radiculopathy_physical_therapy_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/fasixazijaz/ghjn1ha/mods_para_pk_xd.pdfIn PDF document text
    • http://luxisulejoxo.getenjoyment.net/irregular_verbs_list_a-z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_90771041754941369de55cbae44e0795.pdf?index=trueIn PDF document text
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_1afc643cbed14f76bae770a1706d8f15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/expression_of_interest_job_letter_template.pdfIn PDF document text
    • http://lurarapekakaka.atwebpages.com/boost_c_application_development_cookbook_second_edition.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_86ddc25969d343aa829cff62bcf36e11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/28491969026.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/mewedapalorukejul.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_cad680a87ad84ad78f0df0f002feffa5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falevi/59994998165.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_a81ff7689bab44a8a448005c80d46aa2.pdf?index=trueIn 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_off00010a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A44 5584 bytes
SHA-256: 15d4e5116e59779d31d314475c049e4c9af78dbda99acb160a9f33560c7fa6c0
font_01_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 11560 bytes
SHA-256: 964dd6809b7bf4c7ca758cba794c0a5d7eab8ff666a1b0aa31a17718b8a12683

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