Malicious PDF — malware analysis report

Static analysis result for SHA-256 859aa645ac7b5491…

MALICIOUS

PDF

100.3 KB Created: 2021-02-19 04:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f244129ffbd5f3286d74960dda6c8d1d SHA-1: 77ab44242436a654014b729c2ba9b42ff4b84e9d SHA-256: 859aa645ac7b5491c2649c89ecfe778c22b573f2afcb610dce87efb32d60b990
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and the ClamAV detection as Pdf.Phishing.Trojan suggests malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=the+dark+tower+movie+trailer PDF link annotation
    • https://cdn.sqhk.co/pixukinoma/jijeihj/37944730128.pdfIn PDF document text
    • http://zoxejusozowevo.iblogger.org/capacity_management_itil.pdfIn PDF document text
    • https://cdn.sqhk.co/dedatemaran/hgMgfgf/radiwupubex.pdfIn PDF document text
    • http://nelawetazabuta.66ghz.com/34677552462.pdfIn PDF document text
    • http://kind-insta.site/income_tax_calculator_2019-_20_excelubt2k.pdfIn PDF document text
    • http://itfamily.pro/75191639742p5jas.pdfIn PDF document text
    • http://menformula.xyz/codecademy_learn_the_command_line_answerstyjuf.pdfIn PDF document text
    • https://kuwewukes.weebly.com/uploads/1/3/1/6/131636575/e759ec70db3fc6.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/dz4Xjd1/konolukaxaku.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/NidxWrp/simple_notepad_for_mac.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/fidobakipivogit/zemor.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/comparative_and_superlative_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/alcatel_one_touch_pixi_firmware.pdfIn PDF document text
    • http://xovijoj.epizy.com/defibumeb.pdfIn PDF document text
    • http://rewogaki.rf.gd/tukakizunegemobu.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/21278660730.pdfIn PDF document text
    • http://fexeledusezeto.rf.gd/javakitijibuzoxeb.pdfIn PDF document text
    • http://folizel.epizy.com/babuvipukile.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_off00014855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14855 5052 bytes
SHA-256: ec8d0ad15d96af31fc50bb035cfbf4730505f0624f0e5c7bf26571d98bb45da3
font_01_sfnt_off0001596c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596C 13232 bytes
SHA-256: 96d5bccb4a924a34d45100cfb2e66f02b195a2396268d81c9b8fe31ff496b868

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