Malicious PDF — malware analysis report

Static analysis result for SHA-256 7538d2a7c542c313…

MALICIOUS

PDF

79.4 KB Created: 2021-03-28 06:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f297035775d865b394acd21f723bb367 SHA-1: 9f8bfe1d795d10c5ad7af7645e7fc1fcc8afd816 SHA-256: 7538d2a7c542c3131f7b23c61323ca3f8349257b65331bf15416e9393b5573eb
186 Risk Score

Malware Insights

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

The PDF file contains a lure related to downloading an Android application, indicated by the URL and document body content. It also hosts a large farm of external links, many pointing to disposable domains, suggesting a phishing or SEO poisoning scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://maypoin.ru/wix?keyword=pokemon+x+apk+download+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449996/normal_5fd96a2f4e400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450046/normal_6056f82e296fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386597/normal_5ffb4b082ed78.pdfIn PDF document text
    • http://fevalugumaj.22web.org/oster_belgian_waffle_maker_directions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_60533ffdd2f14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380209/normal_600b084f5dd48.pdfIn PDF document text
    • http://nunesop.scienceontheweb.net/tufet.pdfIn PDF document text
    • http://sanadewa.iblogger.org/best_air_fryer_recipes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415077/normal_6029ad1b288ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494429/normal_605cb2410f075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409258/normal_60011ce2e6082.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sarirepenibe.epizy.com/cissp_book_2020.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_6153a30b41f8424bb6cdfa921c65f51b.pdf?index=trueIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_a52e106c96e14d4fac2f4ed3296f0ed6.pdf?index=trueIn PDF document text
    • http://wopolew.rf.gd/83148054576.pdfIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_4fcad0bf9f8d420e8ee6a634f4118171.pdf?index=trueIn PDF document text
    • http://zarufutebere.epizy.com/analyse_swot.pdfIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/englisch_aufgaben_zeiten.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/40171549262.pdfIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_58e444b10f6140d281e3e61bc9ccecc9.pdf?index=trueIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_d2d661b1048c4952894f1d2a92d32eae.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_33ce29fb19ba43c0827fbdec1dc56feb.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_f8f1d84653b547a9ae6d0b5fb793bc79.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_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 5236 bytes
SHA-256: 7799c001f225842c2cca91297ae7bacaa28f6bc2aaaf057deb6f9d8feb72a053
font_01_sfnt_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 10836 bytes
SHA-256: 1af672b1e1806d2176f65502906bd301530eede07bacf63b733b1116a8ef316e