Malicious PDF — malware analysis report

Static analysis result for SHA-256 be556a4827893ce0…

MALICIOUS

PDF

67.6 KB Created: 2020-12-03 15:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b453cf464f1fb526212570a1d7ab19b SHA-1: d9d78b96dbef9281307f02adef33f77b43dc781c SHA-256: be556a4827893ce0377cb02c6fe7d2bbef57c76fea972eb82bb1ba31ec9609b3
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts numerous external links. One of these links, 'https://traffset.ru/aws?utm_term=bible+study+apps+for+android+phones', is presented as a lure. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7962

Heuristics 4

  • 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.
  • 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
  • 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://traffset.ru/aws?utm_term=bible+study+apps+for+android+phones
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f9f2c749b381.pdf
    • https://cdn-cms.f-static.net/uploads/4410459/normal_5fc0bb504caba.pdf
    • https://kegazesawatodo.weebly.com/uploads/1/3/4/3/134378031/zimaje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/73dd7d41-4142-402b-91f9-0653293e458f/elf_on_the_shelf_return_letter_free_printable.pdf
    • https://uploads.strikinglycdn.com/files/a3bb639f-dbf1-4b93-9e19-ba21ad3eae2a/59795819988.pdf
    • https://uploads.strikinglycdn.com/files/cbcd21da-954c-4887-8007-607f06278f01/bitcoin_miner_apk_android.pdf
    • https://static1.squarespace.com/static/5fc27e6e3398ff7515381371/t/5fc8eaa30b7183349bd6949f/1607002789578/freak_show_sound_id.pdf
    • https://static1.squarespace.com/static/5fc1a551b8467722f1d988e0/t/5fc5c3c8fa04221c71e809fe/1606796233134/wobuxakalebeso.pdf
    • https://uploads.strikinglycdn.com/files/9744d73b-2688-422e-b7b5-010f41c0dea7/12151692915.pdf
    • https://s3.amazonaws.com/henghuili-files2/libros_de_canciones_para_guitarra_gratis.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44e.bin
4da316af402d27d92ead87b1be0d558c466c064568f6167808c0fe2bf15dbceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 5300 bytes

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