Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c386620bea65657…

MALICIOUS

PDF

90.9 KB Created: 2021-03-17 09:21:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0c5b058df2c80620c6570304e7866107 SHA-1: b089207220ad0e7db61fe0fb57f4bbcff5fff157 SHA-256: 4c386620bea656579da30a282e6482a99b7c1e7332ad75c22b4264ad5e8f04da
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to 'La mujer en el budismo pdf'. No scripts were extracted, but the PDF structure itself is indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=la+mujer+en+el+budismo+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445119/normal_602b8611f3aac.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/niwoxodutelidafize.pdfIn PDF document text
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/ab93866b2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477181/normal_5fc94f42de40b.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/33577064076.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/iaphgJG/hide_files_in_canvas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_601489e62a496.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/ggrgiJC/30597807836.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/cKiageU/xewozakorimer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498893/normal_6051299354dc4.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/irobot_roomba_s9_black_friday.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/dXie4hj/cat_running_wheel_gif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489240/normal_5fdf80bebbd81.pdfIn PDF document text
    • https://rikedinodewo.weebly.com/uploads/1/3/5/3/135323941/lonikiwukuranuzim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_d5785c570e8243a7b83088dcc07a4119.pdf?index=trueIn PDF document text
    • http://rodedewezijore.atwebpages.com/nalubikezaperulezaxosoja.pdfIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_07acc2325dfd43c19b46772f01ad7432.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_dbcbb30a2a7e4f899ba776a8e71e62e1.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_98682c0cee54496aa6d788e597aa8a14.pdf?index=trueIn PDF document text
    • http://ginowane.onlinewebshop.net/33270345427.pdfIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_7ea8ee0615e84a0db6ef5c7eeda5c146.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 5344 bytes
SHA-256: 96851f871c7a66a646571a802d18fa586d54918fe03c4a44ea63dfaf06272602
font_01_sfnt_off000136ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FF 12124 bytes
SHA-256: 054db9d91d393a2d9ad20fd2af450a110e97a142cd3b5e4caa9320a5a57a6736

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