Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4147b74e5799f7f…

MALICIOUS

PDF

76.3 KB Created: 2021-05-22 11:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 88d3cc971267cd115521dc9fa8e60e69 SHA-1: e952f02af61b7fca5eb2ba50cf8eeff57fa17224 SHA-256: b4147b74e5799f7fb2e6aa074cf0a6e07bc8e5cb75f9aa5f518917a5b89abddc
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+apply+for+maryland+housing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5ffb428bcb5ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5fc9b49ac5c60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_605155f973e33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491933/normal_5fdf5a13f3a62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450438/normal_5ff21dab515da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426421/normal_5fee49f3d8a07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460694/normal_5fc8de3f73023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5ff36fc6b6982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5fd2d93ccadf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_603b97d30fe1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447460/normal_5fe3929c6797a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_6012882cae189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420939/normal_6064e1fb137d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421056/normal_5fc78d220bcb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_605255b96d62a.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/wolina/free_voice_calling_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ac1f71-aab7-4546-a15a-1381ff22ef71/tugovuguvajotipowavavofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02d1236-d4ba-4009-a015-6d813dc9e990/the_count_of_monte_cristo_summary_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/7958960825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72de5693-eccd-406c-b58a-07f5b7557702/56037247259.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/vuzowekotewav.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/mubagugizugerawefufanigu.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_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 5612 bytes
SHA-256: 61c1c236995155dbe345605be9aad108e1973f683fc21e38f74e78ec5e80d398
font_01_sfnt_off000100c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 10284 bytes
SHA-256: dda89a56594dc24e8c5078350c7bf29b34b53402f4f4308083aeb1996dcfe6a6

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