Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ce885aace73703…

MALICIOUS

PDF

69.8 KB Created: 2021-02-21 10:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7adcef4322b5129e669f48d13037b849 SHA-1: 771bce33907343eca9e6f7d175b0debe36f3cef8 SHA-256: 52ce885aace737030392da1b7a1cbe7039c029a5eb876bb75b067c964718eb68
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains a large number of embedded URLs pointing to various domains, many of which are associated with link farms or potentially malicious content. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wb?keyword=how%20much%20weight%20can%20a%20dodge%20ram%20pull PDF link annotation
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/muzumorum.pdfIn PDF document text
    • http://copyrightviolationcenters.com/82414574411tnw7c.pdfIn PDF document text
    • http://rokexulom.22web.org/70818016639.pdfIn PDF document text
    • http://good-production9.site/97531412601srq2d.pdfIn PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/6509792.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/c74da8319d.pdfIn PDF document text
    • http://nibelv.xyz/nefadulodomikarizebenuyr2.pdfIn PDF document text
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/5866078.pdfIn PDF document text
    • https://gupebuxoguwev.weebly.com/uploads/1/3/4/3/134381402/2379211.pdfIn PDF document text
    • https://nanagufema.weebly.com/uploads/1/3/1/4/131483019/6463168.pdfIn PDF document text
    • http://twobigs.space/21659350175zssxe.pdfIn PDF document text
    • http://interior.estate/colors_in_spanish_worksheet_preschoolt2hrx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dixuzudes.epizy.com/aarti_sangrah_marathi_free.pdfIn PDF document text
    • http://tijoduv.epizy.com/bluewood_ski_area_snow_report.pdfIn PDF document text
    • http://ziriboxemo.epizy.com/juvisov.pdfIn PDF document text
    • http://goxabepod.rf.gd/70469711904.pdfIn PDF document text
    • http://xuxusemo.epizy.com/physical_inventory_count_sheet_meaning.pdfIn PDF document text
    • http://segudufarus.epizy.com/call_of_duty_2v2_alpha_pc.pdfIn PDF document text
    • http://rakumutebita.epizy.com/arcularius_ranch_guide_service.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_off0000d4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E7 5364 bytes
SHA-256: 92aad508dd54840a300736bdee1e98079354c9da5067f837ee6ddda66399b373
font_01_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 10300 bytes
SHA-256: 4bece77fb41e8a49d69b154f686492fbe9b4ba95564f4e05524909fb5fe38edb

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