Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb5e9a4b4494c7f…

MALICIOUS

PDF

92.8 KB Created: 2021-03-20 16:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba638b454b272b382f2d4eccb658a524 SHA-1: 792a8129bf20050e8aaea08030460f1f816da3d1 SHA-256: 3cb5e9a4b4494c7fbba9a9f883d24e552acd2c094a948cb48bad8f4a31c55582
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, 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 indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=layer+2+protocols+blockchain
    • http://tikanaw.mypressonline.com/malayalam_ayurveda_books.pdf
    • http://gelufose.scienceontheweb.net/essays_by_ralph_waldo_emerson_download.pdf
    • http://junumidutuzakox.getenjoyment.net/best_programming_language_to_learn_reddit_2020.pdf
    • https://gerezedudamun.weebly.com/uploads/1/3/4/5/134507019/6340314.pdf
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/4ba2375a.pdf
    • http://domen3.club/47131448937g86dv.pdf
    • http://paxosij.mygamesonline.org/mitudogobixozituneroxi.pdf
    • https://sozezitevi.weebly.com/uploads/1/3/4/6/134639304/dewakiwikuzeg.pdf
    • https://cdn-cms.f-static.net/uploads/4530910/normal_6036b739c8ba7.pdf
    • http://naturalgood.space/64165120759rq994.pdf
    • https://jawonuvanez.weebly.com/uploads/1/3/6/0/136021807/fogigazu_zejidadejimem_nukuxiveju.pdf
    • http://avto-trokot.xyz/codificacion_del_derecho_administrativoyk810.pdf
    • https://cdn-cms.f-static.net/uploads/4447465/normal_6035ad9d21027.pdf
    • https://rimapanexap.weebly.com/uploads/1/3/4/1/134108998/vafutowetuzozoxutoke.pdf
    • http://cashbackk.site/48449931251swgx7.pdf
    • http://pinegobojefo.getenjoyment.net/96990267008.pdf
    • http://lorewipa.scienceontheweb.net/the_snows_of_kilimanjaro_flashbacks_analysis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5cdfacaf-84ac-4ccb-a203-996607d3910c/best_way_to_start_doing_digital_art.pdf
    • https://uploads.strikinglycdn.com/files/e36c4b36-1e88-4cf0-b025-b8c1add8bf0f/40394451888.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_off00012b26.bin
93a77f6a36f7b8414ff3443e606018368149596893cab8c5c7dabfdf277ffdd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 5400 bytes
font_01_sfnt_off00013d86.bin
113f6400d4bf768bd0c7c81f2be05d1ccfce66d4db4af342e4966ea3fed326b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D86 12068 bytes

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