Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e491ba253919dd…

MALICIOUS

PDF

76.1 KB Created: 2021-04-07 14:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 77fb85d292a2f7841594a80b7a56cb01 SHA-1: 1d5a2dcfa11d382beaa00f996f4b613c99e5c50d SHA-256: 56e491ba253919dd6dbee19c57f37ca805a0576d4f2b17354bc1e9464c8c814d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as 'https://nipisod.ru/strik?utm_term=how+to+wrap+a+shoebox+present', likely serve to redirect users to malicious content or phishing 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 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://nipisod.ru/strik?utm_term=how+to+wrap+a+shoebox+present PDF link annotation
    • http://fofumumitem.medianewsonline.com/tidetekigowojataz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473926/normal_5ff779713f4f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5ff0f81028474.pdfIn PDF document text
    • http://nugowimabu.mywebcommunity.org/calculista_de_estructuras_simon_goldenhorn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_60412ff88ca04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449604/normal_602f11e9d1c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_60465b12987e0.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/mutirexa/xeritubutenaz.pdfIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_18f79a9b683546228518be8b70a469ff.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_fd8c30f132f043cf9472a93e64b63276.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusagi/scag_mowers_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/11302688078.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/gcse_balancing_chemical_equations_worksheet.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_7d77d6b67754491b81efe7bcd12cce4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91d7f43-3632-4f01-a3ff-7b5cabff5512/five_nights_at_freddys_5_free_download_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/36833158401.pdfIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_d210cc2541b2438bb9c8b5ea1fd6476f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/garageband_file_extension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8cfc2bd-1ee7-4db6-b00d-cfbdbd368dc8/scout_log_book_in_tamil.pdfIn 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_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 5136 bytes
SHA-256: 29d36ff9d8da0b14662967adfe177f87a9a9cb3759202bc754e96bcf2b39534b
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 10628 bytes
SHA-256: 807b53675160c28139aad8dda3f62bc8c7fbb2a0886885c1e36e22600b502619

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