Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d0d9663c71cd2d…

MALICIOUS

PDF

74.7 KB Created: 2021-04-06 07:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fb6409ad0cc877faf0f234d733bd5538 SHA-1: 7a71edea8d1f29c030f28f27206d5474c8720578 SHA-256: 33d0d9663c71cd2da3407438fbfdd48e1c34666c61bd6f5b72772d44c922ca7f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to redirect users, likely to phishing or malware sites. The embedded URLs point to potentially malicious domains, including 'resalured.ru', which are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=amino+acid+table+pdf PDF link annotation
    • https://cdn.sqhk.co/viwitukaz/ij2zQyW/mosipodaronofakor.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/CNjdgcs/27428983779.pdfIn PDF document text
    • http://premial.su/93667438039jicq1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_60515577cb080.pdfIn PDF document text
    • https://cdn.sqhk.co/widobixi/kijPgiV/jogos_psp_para_android.pdfIn PDF document text
    • http://verification-help.com/665433622800o8d5.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/0vOY9hg/63250423105.pdfIn PDF document text
    • http://cabinetsly.xyz/rotekilofekozoac3fo.pdfIn PDF document text
    • http://masterpowerpoint.com/personal_assets_and_liabilities_sheety8gp5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_602ddadcc6fe4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa97a28b-bb28-438e-9361-3be730f1f990/focusrite_scarlett_2i2_studio_pack_3rd_gen_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a550f89-3c01-4cf3-994a-4162131d599d/el_libro_tibetano_de_los_muertos_frases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa6da0d-5b50-4c59-8f0e-23bc16b2381a/i_am_the_messenger_book_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/25991155784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/090b93ab-cf7b-4728-84cf-fcbdae2d81e5/53343529044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26ebf6d-ce48-4fcc-9a22-afa0a6409aba/kozaf.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/place_value_expanded_form_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/sony_rx100_vii_manual_focus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371423ce-c063-4d71-aaae-646b106756d3/44494364628.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/how_to_use_yes_man_in_a_sentence.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_off0000e849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 5156 bytes
SHA-256: e409ee28fa38b66fab1956c3305ce85541faec231dd053f662d665dd04768794
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 10392 bytes
SHA-256: a8f3c55d598369f71a2462b893f23a476d981a81da04c320ee272a5d307d90e5

Open this report in the interactive analyzer, or submit your own file for analysis.