Malicious PDF — malware analysis report

Static analysis result for SHA-256 7766df30bfae7485…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 08:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1b5636f6b892a62648428f41d070604 SHA-1: 583d71a75bd04241a25d294da3026a40143a2eab SHA-256: 7766df30bfae7485a46ce043dea2866a97c48f28ebc712ce53416580bc301ed5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive URL list suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=arithmetic+exercises+pdf
    • http://ladirojenovezoj.mygamesonline.org/caballo_de_troya_tomo_2.pdf
    • http://beririka.scienceontheweb.net/64563081873.pdf
    • https://cdn.sqhk.co/wadelovelo/qhfcZmA/8443_heron_circle_ooltewah_tn.pdf
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/fufexomek_vosexemekog_vekugedowobo_maxipo.pdf
    • https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/tamokuxep-gokomuf-lonaruwekefose.pdf
    • https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/fomidolafo.pdf
    • https://nitogufufuwal.weebly.com/uploads/1/3/3/9/133997090/6350144.pdf
    • http://nitiwomifigurod.mygamesonline.org/12748443237.pdf
    • https://tabowemonikose.weebly.com/uploads/1/3/5/9/135957185/07c2f81f33d0.pdf
    • https://gejabadofezeda.weebly.com/uploads/1/3/2/6/132681436/gijusok-tifelapirudenod.pdf
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/f8bb43.pdf
    • https://cdn.sqhk.co/kezulegol/RJPQm11/emergency_ringtones_free_download_telugu.pdf
    • https://kumevilowe.weebly.com/uploads/1/3/4/5/134598600/9169311.pdf
    • https://cdn.sqhk.co/bopibege/gficgc2/juventus_vs_novara_live_in_which_channel.pdf
    • https://damenuxorofupob.weebly.com/uploads/1/3/4/7/134711178/rukidorulowonodul.pdf
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/7697b3c8f6.pdf
    • https://julovupepopa.weebly.com/uploads/1/3/4/5/134522834/jozitikezog-fizugew-sedazanuda.pdf
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/timasarulos_wijexeli_mewufemit.pdf
    • https://wisemidotoveto.weebly.com/uploads/1/3/4/3/134349295/xabodok.pdf
    • https://cdn.sqhk.co/kupujape/fxhfmzy/13786722268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_cb05ee2876054c06b62e6836de18b276.pdf?index=true
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_83b47f4cdbd848f58925f42484f09f04.pdf?index=true
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_42d9d07bd9314ce8bd42a149b81766a3.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_off0000f11a.bin
3ac6c37efa4f54b4d069c7c207a4e4a994ad8cc027eb9312c55183cfedd65eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 5208 bytes
font_01_sfnt_off000102b1.bin
1fa98c320d922ceb47662870acca0e8e6a88a0f803d7c0de1656937646830d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 10992 bytes

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