Malicious PDF — malware analysis report

Static analysis result for SHA-256 47214812ea83bd23…

MALICIOUS

PDF

90.2 KB Created: 2021-04-07 18:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 79713c2e9d710f380ca6b2b5684de2c4 SHA-1: bb39af2c9f73d88b40e3fcf2e5dc65dd95a97098 SHA-256: 47214812ea83bd23bae82126663e52a0b69363d38a901fb93f1737a8b37b4499
226 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to disposable hosting and suspicious domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://vilenefex.ru/strik?utm_term=amar+chitra+katha+stories+of+krishna PDF link annotation
    • https://bokoxopeke.weebly.com/uploads/1/3/4/2/134266118/tazimovuzuputig_katonigune_sutenebaxafedo_zekarodavu.pdfIn PDF document text
    • http://skout.tech/44554346167rbxto.pdfIn PDF document text
    • https://xobuwepowitapim.weebly.com/uploads/1/3/0/7/130775805/812e753c2145cd3.pdfIn PDF document text
    • https://negogepif.weebly.com/uploads/1/3/0/7/130775604/2693855.pdfIn PDF document text
    • http://sovetnik53.ru/annual_family_income_certificate_formatpjlfl.pdfIn PDF document text
    • http://gratoraama.space/murder_hornet_nest_found_in_blaine_waef4vz.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/didujowizolefuxage.pdfIn PDF document text
    • http://help-igcopyright.xyz/janoviwugiwedozqyor6.pdfIn PDF document text
    • http://souve.me/79217921005c00uh.pdfIn PDF document text
    • https://xunowivoratidom.weebly.com/uploads/1/3/1/6/131636824/navojopedujulalore.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/necromancer_story_unlimited_gems65s63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/276b3633-e7a2-4910-9cb4-6d7be4da686f/33210971648.pdfIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_f9209880e3d64b1c8332e7b14637f7c8.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_8f5948cc3b5d47fca3e54fad497dbca3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e0532ab-f311-4cfd-988c-43dbb905a638/16434980847.pdfIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_df45ea10b10a411384c77b8a60168c06.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_17e9ad2efee64f40ab1dbfc460a84b14.pdf?index=trueIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_2a6783aba8934d0aa7cd1f2a04e857e4.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001251a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251A 5144 bytes
SHA-256: 52ed20e5f2c6b709b03b5625d304f8f1ebca884a526c0c5c48e6b94000c8643b
font_01_sfnt_off00013668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13668 11060 bytes
SHA-256: c76fd001665bba7fcf29170366914f0f1c954344fa2cd0a5215b19a4905d2267