Malicious PDF — malware analysis report

Static analysis result for SHA-256 828ba51988a22704…

MALICIOUS

PDF

79.8 KB Created: 2021-03-20 06:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28bf4ae2f2a1e7f42b68287810f363a0 SHA-1: 108b19f3ba5c26a6804142ea0b5b28f6cf3fd943 SHA-256: 828ba51988a22704e2ae9f72a6899eb603fdcc16a752fbbd2c5d41be9d2f520b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/strik?utm_term=kicker+hideaway+hs10+manual
    • https://cdn-cms.f-static.net/uploads/4464301/normal_5fd0e2de57e5b.pdf
    • https://cdn-cms.f-static.net/uploads/4453338/normal_6033d52540317.pdf
    • https://cdn-cms.f-static.net/uploads/4387046/normal_60407edfc97f8.pdf
    • http://debuged.mywebcommunity.org/how_to_read_the_akashic_records_book.pdf
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/6184827.pdf
    • http://sopesukenapad.scienceontheweb.net/44831858461.pdf
    • https://cdn-cms.f-static.net/uploads/4415946/normal_5fea1dbebefdb.pdf
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/zitageze.pdf
    • https://cdn-cms.f-static.net/uploads/4462727/normal_60438f221e99e.pdf
    • https://static.s123-cdn-static.com/uploads/4489976/normal_5fe5d6c1b356c.pdf
    • https://static.s123-cdn-static.com/uploads/4404528/normal_5fc7fd95ef886.pdf
    • https://biwopotalar.weebly.com/uploads/1/3/1/4/131438783/8842567.pdf
    • https://static.s123-cdn-static.com/uploads/4369317/normal_5fef9472e5973.pdf
    • http://noxopadorilu.iblogger.org/deficiencia_de_vitamina_b2_en_aves.pdf
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/a9932c54.pdf
    • https://cdn-cms.f-static.net/uploads/4476421/normal_60539e58f105d.pdf
    • http://peromopativej.mypressonline.com/lufav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_ffae6af23f594e4ab6a7aa3dafacc616.pdf?index=true
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_7ed74921299249b3bdac762505afe8c8.pdf?index=true
    • http://vumavoralamo.rf.gd/xuwixapope.pdf
    • http://lojabupabavize.onlinewebshop.net/tp_link_tl_wr841n_bd_price.pdf
    • http://jevigoxiferoka.epizy.com/blank_notes_page.pdf
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_81056918c2594e489655bf3c103fa88a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4bd.bin
0fe7324219a5fdf94a2811bb1eb25fc2d0cc1e2bb473ccd584fc4e872d755dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 5600 bytes
font_01_sfnt_off000107b8.bin
e812813d46f43d0851258ad1c0ef2f7e6af79d8360794733557e5e50ff6e0171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 12916 bytes

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