Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6325c6751ed5416…

MALICIOUS

PDF

80.6 KB Created: 2021-03-15 16:59:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 89a31d9a41c3199b9a80ad7c8efec663 SHA-1: 06fe949358bf5e808fd6f355f5589f6ae9fd873d SHA-256: a6325c6751ed5416a8fd61ef9976e4e9dcc161fc57521c8d22a4e6c441db0d0b
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many pointing to disposable domains, suggesting an attempt to redirect users to malicious content or download sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing pretext. The ML classifier and ClamAV detection further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://kuzutuzo.ru/123?utm_term=driver+acer+aspire+e14+e5-+475g PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5ff31f1291267.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/pevisaxekalizotixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390382/normal_6004c2ff0bf4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_603ef09aba10a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481166/normal_6008e66ea4006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_600f0983e43c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5ff78359d8a5f.pdfIn PDF document text
    • http://sagunutu.medianewsonline.com/trx_strap_workout_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_604f732b437d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_41e5ca0900aa4bf8adf21418ad6a1a96.pdf?index=trueIn PDF document text
    • http://xodijofo.epizy.com/what_words_begin_with_em.pdfIn PDF document text
    • http://pofedeguw.rf.gd/what_is_a_piebald_dachshund_dog.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/apache_win32_binary_msi_installer.pdfIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_7b394545cd7549fd9ddfa84a97f7e776.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejideba/kexegabutilugugazagafe.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/xofebivajox.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_c027a82137bd4bb7aedb3877bfdf6261.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/levumoduf/up_board_12th_result_2015_marksheet.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_2a0eb473a26f4dabb77891a7db6850a3.pdf?index=trueIn PDF document text
    • http://zitoveruvet.epizy.com/steel_tensile_test_lab_report_conclusion.pdfIn 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_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 4996 bytes
SHA-256: d07f6b3977d6a6bd6420677c73adc6f500bdfe0e98ad56a100df77061dde8db0
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 11192 bytes
SHA-256: 56290afe5f2fb853e46654cfed853a3739e319c38c6554f494794d87aece66e8
font_02_sfnt_off00012507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12507 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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