Malicious PDF — malware analysis report

Static analysis result for SHA-256 f392cd8050cb6bb0…

MALICIOUS

PDF

87.4 KB Created: 2021-03-26 08:01:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c87cfef2b2f249b46a668a31ff195a33 SHA-1: 7edd469c0814fa7bac1f733ec955a100db9885b1 SHA-256: f392cd8050cb6bb01295a367aba0df83a3a5e7ef9535e3a9b726ec0088c69ff9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jacksth.ru/strik?utm_term=what+is+a+stylebook
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/2728309.pdf
    • http://zesegalos.scienceontheweb.net/peran_cacing_tanah.pdf
    • https://cdn-cms.f-static.net/uploads/4368503/normal_5fe714abc9317.pdf
    • http://jupifidupepir.getenjoyment.net/ririvigepanojonelamewe.pdf
    • http://botefedej.sportsontheweb.net/xasimoxijarugewidude.pdf
    • http://makelemeg.mygamesonline.org/76999877690.pdf
    • http://sujimelowakolop.medianewsonline.com/32854466739.pdf
    • https://static.s123-cdn-static.com/uploads/4384464/normal_5fcea2ff44f82.pdf
    • https://static.s123-cdn-static.com/uploads/4476766/normal_5fcbcdfb7b2e7.pdf
    • https://static.s123-cdn-static.com/uploads/4388283/normal_5ff9eefa75b56.pdf
    • http://zuzorovix.scienceontheweb.net/apush_amsco_book_2015.pdf
    • http://tizadejaso.getenjoyment.net/buku_agama_islam_kelas_12_kurikulum_2020_penerbit_erlangga.pdf
    • https://static.s123-cdn-static.com/uploads/4373769/normal_5fc70d61d8931.pdf
    • http://wepijafiguwenan.mywebcommunity.org/74853951252.pdf
    • http://palaxofivuleduj.medianewsonline.com/the_raven_movie_2006.pdf
    • http://nadefememidep.medianewsonline.com/adobe_premiere_elements_2020_update_download.pdf
    • http://fitatuvepejozo.sportsontheweb.net/tuwixurovatafu.pdf
    • https://xaleratugigajij.weebly.com/uploads/1/3/4/6/134631249/09d670.pdf
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/korolumaw.pdf
    • http://gagogepatajebe.medianewsonline.com/xamujebetewuridubemufiza.pdf
    • https://xavamukunakupa.weebly.com/uploads/1/3/1/4/131437969/wapubopinan.pdf
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/lukejegesusa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gonegexunu.myartsonline.com/29864740582.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ce9.bin
1191fdc96b8ff4af218b45e8197f7633bb80dfccd4710c44b65535d3882807f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 4680 bytes
font_01_sfnt_off00011ce8.bin
d5086cb5a68b51f3c702404db4e44d4d68ee0f24183e15249186d2e5c3a7ba51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 10904 bytes
font_02_sfnt_off00014201.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14201 4324 bytes

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