Malicious PDF — malware analysis report

Static analysis result for SHA-256 399d689a3f7355a8…

MALICIOUS

PDF

71.9 KB Created: 2021-02-15 02:57:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 52b90f0d8cc2702d71bcac1294b7e777 SHA-1: 3fde1ce85bdefeac20de1e289b17358bc344dd86 SHA-256: 399d689a3f7355a88d66e9bd882f007498be6966aa98d53b97060177310e106f
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains an embedded URL, 'https://maypoin.ru/123?utm_term=bell+hooks+belonging', which is likely used for phishing or to download a secondary payload. The PDF structure and embedded content suggest an attempt to trick the user into visiting this malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=bell+hooks+belonging PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418184/normal_5fcd43f7d4d35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fe0340757d1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392666/normal_601558c489a9b.pdfIn PDF document text
    • http://zegoves.22web.org/vemivavupiba.pdfIn PDF document text
    • http://kitufavurakural.iblogger.org/new_annual_income_tax_form.pdfIn PDF document text
    • https://cdn.sqhk.co/luwonowuwig/hfhjfzR/33054623483.pdfIn PDF document text
    • https://cdn.sqhk.co/nakizenonetu/dgfheie/rewritecond_remote_addr_ipv6.pdfIn PDF document text
    • http://rituralajozeli.iblogger.org/80719004522.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepisuv.epizy.com/colour_butterfly_hd_images.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/5748647018.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/766306872.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/xoxajulesupovena.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/crossword_answer_for_deliberate_destruction.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 4896 bytes
SHA-256: 28965f6266c92262da2b7b6f91b98d818a01f5debf7dcab59c75e7b441dc1212
font_01_sfnt_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 10420 bytes
SHA-256: cbbb9aac5381691bb56c2ce19e4b8e7f96de871ef5144c898b69ea37dd4a1277

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