Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a081038d1d5acc…

MALICIOUS

PDF

71.4 KB Created: 2020-12-23 00:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ea832d26f747f638810a084c980b3f10 SHA-1: 05716e5464ec8a5c3959cc5586551b8c7fa6f7ba SHA-256: d3a081038d1d5acc5765162f3d458efebb86800930cb749b36958f6b4e023d52
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=inglourious+basterds+english+subtitles In PDF document text
    • https://wabozejitikaz.weebly.com/uploads/1/3/4/4/134495441/bekujesoz-karuwewenava.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/nimuziberobubu-vovudanine-nipodezibe.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/xurejetexu.pdfIn PDF document text
    • https://tukowozurowogof.weebly.com/uploads/1/3/4/4/134440104/5188320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_5fc3033756edb.pdfIn PDF document text
    • https://kapegidaboxisi.weebly.com/uploads/1/3/4/5/134527108/5b08cf770.pdfIn PDF document text
    • https://gufurokis.weebly.com/uploads/1/3/1/4/131453316/muduzu.pdfIn PDF document text
    • https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/4627173.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/wukevirenesu/door_slammers_2_cheats_free_gold.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/google_sheets_sumifs_greater_than.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/nuxobakuzor.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/aplikasi_blackberry_os_5.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_off0000bc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8F 7240 bytes
SHA-256: 9311a5370bb3d104566b16bc55eb444ae0819cdb4b5d87c0052de6b23da0c909
font_01_sfnt_off0000d473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 5164 bytes
SHA-256: 282e5dce0340c7419c558094d16ccf0ca1f2bd1d51faf3aad83138a8511c54a4
font_02_sfnt_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 12504 bytes
SHA-256: 55111c5c84ba0d90901a45bacaad12bc4f16ad2e8f4d982f31cccf333bc648c1

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