Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7c238990f2b361…

MALICIOUS

PDF

76.1 KB Created: 2021-03-16 18:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60cda90b92b27189199fb8eea7a03046 SHA-1: 9299a48c44500dc4d62e74988349b8a88c5c32e3 SHA-256: 9e7c238990f2b36193e0a631453be448adcb241a8fc6c3e153736455e85ad940
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as academic resources. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=fundamentals+of+communication+systems+global+pdf
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/jevise.pdf
    • http://lodomujimujug.mywebcommunity.org/aashto_guide_specifications_for_lrfd_seismic_bridge_design.pdf
    • http://dokojekiferej.mygamesonline.org/37195594503.pdf
    • http://lumufurisazela.mywebcommunity.org/how_to_test_dt466_injectors.pdf
    • https://zomurudol.weebly.com/uploads/1/3/4/4/134492975/155696.pdf
    • http://gonalotuturopil.mywebcommunity.org/67371619736.pdf
    • http://ravevuzovije.mywebcommunity.org/brills_express_newspaper_today.pdf
    • https://novizatedorik.weebly.com/uploads/1/3/6/0/136095988/7542651.pdf
    • https://nojamatisi.weebly.com/uploads/1/3/1/3/131384142/3208922.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_c4bf3d2eb0b9452db37764e9cd72bb26.pdf?index=true
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_34ed5a54a39a4ec18a47d3e6bfdc4842.pdf?index=true
    • https://s3.amazonaws.com/dejazuvorira/odisha_road_map.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/43831083711.pdf
    • https://s3.amazonaws.com/daraniwekamidir/rirunukegovumukefumi.pdf
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_b247fdedfe0a4f038d080ea25a6d77f9.pdf?index=true
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_497d79fe601e4d229dc9519e5b727f47.pdf?index=true
    • https://s3.amazonaws.com/gosete/what_is_qr_airline_code.pdf
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_4a8a7b2ddce34f6bb8f388ccb1e0325c.pdf?index=true
    • https://s3.amazonaws.com/jivagajamav/toruruxilesalizi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf1.bin
714d0b6614ee5db7a0687e9bafdd7bbffe879ff5f54d5275ce9116f0c6717a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 5576 bytes
font_01_sfnt_off0000ffe9.bin
7139a3c5d694adb3fadc0eaf79eeabe50d4ad75f218c4805f18ee52354babe30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 10392 bytes

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