Malicious PDF — malware analysis report

Static analysis result for SHA-256 b241812f43a36fa9…

MALICIOUS

PDF

79.1 KB Created: 2021-03-23 02:00:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 65cd2c821ee66e6cf6e96d9347d7a26d SHA-1: 9f39a2ca00ad981465ae34189fc330104b76c5aa SHA-256: b241812f43a36fa99f18ac739d57a3e9db74e1dc5abb1064b6e3cbe983ab0d36
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, suggesting a phishing or scam attempt. The ML classifier and ClamAV both strongly indicate maliciousness. The embedded URLs, such as 'https://leonvi.ru/wix?keyword=respawnable+mod+apk+8.2.0', are likely intended to redirect users to malicious content or downloads.

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 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://leonvi.ru/wix?keyword=respawnable+mod+apk+8.2.0 PDF link annotation
    • https://gaxowaxogofesix.weebly.com/uploads/1/3/4/7/134719425/sapivezevox-jojizo-tubusik-bezawi.pdfIn PDF document text
    • https://giromazipudu.weebly.com/uploads/1/3/1/4/131453901/warunurenuza.pdfIn PDF document text
    • https://zemonawajut.weebly.com/uploads/1/3/4/6/134688337/gogosasugiv-gerodiniginal.pdfIn PDF document text
    • http://betmoy54.com/xuvoxii9p9a.pdfIn PDF document text
    • http://agentsecure.space/33012156147t2rtg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/bosch_nexxt_500_washer_not_spinning.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/college_degree_diploma_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db04643e-05df-4fd8-b660-6bd7e015ef1e/what_do_the_colors_of_the_advent_wreath_candles_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/absorbable_and_biodegradable_polymers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a67e96-6b8f-4add-9ae6-362a0de4f25d/toyota_camry_xse_2018_v6.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_30b780dce3c343a1ab08143e91bbe3c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liguwubore/rorurudidiruxik.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/jomoguvowuzoridakedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e0af11-c290-4760-9d23-494eea503c61/61850560920.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/87517164010.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/definiciones_de_arte_segun_filosofos.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_1883cb8d8b554c4fbbfaafda1a36d071.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/accounting_for_management_decisions.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_da32ed2c48b44c44881a0d8af91743be.pdf?index=trueIn PDF document text
    • https://58fabbca-0322-4868-a582-948aa19840f9.filesusr.com/ugd/93748c_b6b01bc7eb104c20a19e027ee1d0e036.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_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 5812 bytes
SHA-256: a65ad668f1efb23f28a07ae7864c6754d5affbf5ee69be5102efed10a4ba7691
font_01_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 11064 bytes
SHA-256: 3c19f660ae89d5fdab86d27cd533b15efb46c8f392a8b276d5c3067d71e9e434

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