Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecc3dc347b72948…

MALICIOUS

PDF

75.8 KB Created: 2021-04-07 10:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 395d29f9214e870143d2537afedd5b40 SHA-1: 226149ee86c4d83a45507e8fbc02f64be460ba2c SHA-256: 3ecc3dc347b72948558241451e6c921e30a77e53bc0c124f3ec86abe440b7048
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links designed to appear legitimate but lead to malicious sites. No scripts were extracted, but the presence of many external links points to a lure mechanism.

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://maypoin.ru/strik?utm_term=is+headphone+zone+safe PDF link annotation
    • http://binadof.iblogger.org/12851592947.pdfIn PDF document text
    • http://zepawagir.iblogger.org/sc_dmv_appointment_cancel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_601ff3265961e.pdfIn PDF document text
    • http://xovoxovija.iblogger.org/nalozarigalevivi.pdfIn PDF document text
    • http://belplitka.ru/itools_for_pc_64_bitni4bb.pdfIn PDF document text
    • http://rrrrkkkkk.space/68335902352vn5vw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_5fd669f90e325.pdfIn PDF document text
    • http://xulepeban.22web.org/zopepomepomuviwera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fef423869296.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476140/normal_5fe5f06e17dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_605b184659a56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446638/normal_604d6cdd5c8f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_602b3c1ec8d39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_424584bc510a4764bd77bfbc7b835094.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_ff1e499c7cd048ddb3497dd8c6e8d970.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_36746df25bdb4b1cbb06216a9255ebfe.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_c9d2a336002342d0a92614894fc23bc7.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_3fac4b50466547f3bc6a690cd3e10bd6.pdf?index=trueIn PDF document text
    • http://vikomalagojuv.epizy.com/pibivegolemiwal.pdfIn PDF document text
    • http://wizugujolapalel.epizy.com/company_presentation_letter_sample.pdfIn PDF document text
    • http://goxulotevixoda.rf.gd/oxford_dictionary_of_literary_terms_4th_edition.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 4988 bytes
SHA-256: 5d16e226fc963a20a6a935d7105e8effc6c3c4de1ef79d2487ea1e7031249b4b
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 11308 bytes
SHA-256: c4ecd077fda9e5b244290f36a18c0a1d1d6eefa84e4c0601b49934bf2085f06a

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