Malicious PDF — malware analysis report

Static analysis result for SHA-256 524d6b8aa2a39a1e…

MALICIOUS

PDF

77.5 KB Created: 2021-04-01 01:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2450a589e24ace3e5c56c7a23f78d31f SHA-1: 7dcdb50ef570bb7347db748a4c19d2ffaa37fe75 SHA-256: 524d6b8aa2a39a1e88f86fdb8b981afbbb722763d80021513810f927764153b9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a site offering 'droidtale apk download'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://jumiwimov.ru/wix?keyword=droidtale+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459654/normal_6047c1d9a2b03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415543/normal_604472f4dd050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404990/normal_601cf92e55d20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_a355bb64909e4ee3a769b0f4a58f57fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/45919141211.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/information_system_business_analyst_jobs_in_canada.pdfIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_cc0aa14638c84fcea1804271905d7882.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/best_football_training_for_9_year_olds.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_1e4f6989d58442ff9bbb6e97cd6b342b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/how_do_atoms_combine_to_make_molecules.pdfIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_221dd20db0464d32a593cb6d649b0743.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/27607230832.pdfIn PDF document text
    • http://palibam.atwebpages.com/12246584916.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/58657038110.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/bowen_series.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/dovobebeme.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/lawn_boy_push_mower_air_filter.pdfIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_72a2e3fd03f64a9aaa2df49d0314f6a6.pdf?index=trueIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_697322754b3e44959c5683b0c8b31a87.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_1c09c6c1786844d19d28a286a88e3b3b.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_ddea7b3d7ea34d2aa6f620e1fda0e401.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_afb998e14854485e952d734f5c2eca49.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_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 4928 bytes
SHA-256: 8b77442c60d28db8bd86d65c4d069d28ef693a9286a24c53eec55c903267b09a
font_01_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 11164 bytes
SHA-256: 6ad391298ba3653238bf5f9d2de9f0c57cced97412eafa5278ca6e58d78457aa

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