Malicious PDF — malware analysis report

Static analysis result for SHA-256 128a27a2f009ffed…

MALICIOUS

PDF

92.4 KB Created: 2021-02-10 13:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 862bce3715c6d715fc91bbf344b07712 SHA-1: 4265c0d05093069a66672c20517b333cc7428b81 SHA-256: 128a27a2f009ffed9e7e9d9f559dfbb1894754e646a3c8b083c5ddf75fd24203
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=romans+13+commentary+guzik PDF link annotation
    • http://markettop.pro/8247845858104bmz.pdfIn PDF document text
    • https://ribovaboj.weebly.com/uploads/1/3/0/7/130775049/xawur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486061/normal_600f79c8b236f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5fd31db721041.pdfIn PDF document text
    • https://fapudajom.weebly.com/uploads/1/3/2/6/132681453/kegosevun.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/the_defence_of_duffers_drifthp13p.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/e732d13ba9c.pdfIn PDF document text
    • http://storeyou.store/android_emulator_screenshot_location_windows18frk.pdfIn PDF document text
    • http://e-sparks.ru/96655872210joj61.pdfIn PDF document text
    • https://zubikuzo.weebly.com/uploads/1/3/1/4/131453486/7672309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472491/normal_5fef53ab562bf.pdfIn PDF document text
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/d04b06f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nitovotiroxe.epizy.com/daritipaserudatunujilap.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/hess_s_law_problems_with_answers.pdfIn PDF document text
    • http://xoxozuzupa.rf.gd/capacitores_weg.pdfIn PDF document text
    • http://getojigukas.epizy.com/bbc_learning_english_podcast.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/26170883407.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/dota_2_gyrocopter_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/milobig.pdfIn PDF document text
    • http://ruwevabebivis.epizy.com/nuxibesunibalekipexelonu.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/nondiscrimination_testing_worksheet.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_off00012b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B92 5524 bytes
SHA-256: 049ebee993c2e2abc47db1d26d785c7e0fe54f52402477fc7768750cb7b270c0
font_01_sfnt_off00013e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E61 10560 bytes
SHA-256: 8b6ee7ec18011f7846d54456e02c83c2deefc255d5efd0fe43a77f29569c9dbe

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