Malicious PDF — malware analysis report

Static analysis result for SHA-256 1425860304a99faa…

MALICIOUS

PDF

82.1 KB Created: 2021-03-29 23:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 72094db34fb9e0dc25173f2622c39303 SHA-1: 5b58c0c08f9e3ad644eec85c4849043ccb6873cb SHA-256: 1425860304a99faa2f3d2b181029fa03c1d5e1e2e394581c757d44d5ba3e6df7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF SEO Link Farm', suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the presence of numerous external links, including suspicious domains like druttle.ru and weebly.com subdomains, points towards a phishing or content-luring attack vector.

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://druttle.ru/award?keyword=livro+de+atualidades+para+concursos+pdf PDF link annotation
    • https://ritixalasan.weebly.com/uploads/1/3/4/2/134265532/rafivadajufat-nonur-suwofijivowi.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/7cb1e4d665.pdfIn PDF document text
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/sulefajun.pdfIn PDF document text
    • http://apsdd54gfv.xyz/poesie_l_ecole_de_maurice_caremeklv2v.pdfIn PDF document text
    • http://boomua.site/47480665224f5urv.pdfIn PDF document text
    • http://8bitbeardsco.com/kavonalidaxetagarokumatujhjwq9.pdfIn PDF document text
    • https://teduraxiwerul.weebly.com/uploads/1/3/2/6/132681384/sosebejopifabu_rotamumo_fijinurifof.pdfIn PDF document text
    • https://webexopugidoxog.weebly.com/uploads/1/3/4/3/134319438/705225.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/sepawi/daytona_beach_police_department_online_report.pdfIn PDF document text
    • https://cbf60184-924b-4e65-abc2-244eb733ec12.filesusr.com/ugd/9a25f9_119bb6b01c5041b4aacfbdf6feeaaa2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/takekijakebuderatam.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/widijugunopedusinaburulit.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/how_to_download_gamemaker_studio_2_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/what_contemplate_mean_in_arabic.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/new_tax_laws_for_homeowners_2020.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_6c1184600ac444238aa2bf7b50cd3ab0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/rodod.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_e6c15b44fe8c479f9253b8b6bac53725.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_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 5148 bytes
SHA-256: 6ec181ff27d3d81f103471a2a1400b175a47dace69d6f3dc94f45a9f190bc014
font_01_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 13356 bytes
SHA-256: 4d6faeaf358bcde37ebc18bff9f9e68f23897b36d8a1156d680bfffd144cf315

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