Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dd09257babbb8a…

MALICIOUS

PDF

73.6 KB Created: 2021-02-21 03:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6bb4aba57414739a0e41db2af0d7f731 SHA-1: a55887cf60a2f8ee181cf48479d4d899427508e4 SHA-256: 21dd09257babbb8a39f80d8932c20e86ded7be6b535eeeeb677db0c7a910c5d2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a large number of external PDF links, suggesting a link farm for SEO manipulation. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded URLs point to suspicious domains, and the document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a specific search term, reinforcing the lure. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=krk+rokit+g4+5+vs+7 PDF link annotation
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/ae7e3b.pdfIn PDF document text
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/vimilevezujez.pdfIn PDF document text
    • http://levantemosaic.com/mofujuxo2igmi.pdfIn PDF document text
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/zakebid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_6031969ae0bfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_6014bbe74d06e.pdfIn PDF document text
    • https://zokanebawabor.weebly.com/uploads/1/3/1/4/131438448/2732300.pdfIn PDF document text
    • https://vozupixog.weebly.com/uploads/1/3/4/3/134312338/639af91c0.pdfIn PDF document text
    • http://roflan.site/chattakkari_malayalam_movie_video_songs47a50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454435/normal_5fdd8873805b5.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/kaxudifubu_vamufobixareki.pdfIn PDF document text
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/tofutovufefuxod_tenejadiki_ruvukaweludopit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502698/normal_6027bd58e25cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/genedesowul/are_discontinued_operations_reported_net_of_tax.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/twenty_one_pilots_hometown_piano_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/jozenovodamidi.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/general_motors_financial_report_1964.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 4560 bytes
SHA-256: 0115eafbb849fd614435db440a5a55ed694ae4b5e3e59410a30fcafa91743d4e
font_01_sfnt_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 10408 bytes
SHA-256: 34e673fe322a3baac514144c6d87915e46f86a604a0c3f784d694cd0ef7f31d3
font_02_sfnt_off00010b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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