Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3f063a96fe1605…

MALICIOUS

PDF

73.3 KB Created: 2021-05-04 05:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a2da5c5654a8b1e9be9cc84602bfe12 SHA-1: 3a3a4984d0f354ca5fdf46363c7d8d6ebd4442c7 SHA-256: 5f3f063a96fe16059c3da69519446d5d892171b7c3e44530e7d7726356e2a5ec
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files hosted on compromised websites, suggests a phishing or credential harvesting campaign. The document body text is obfuscated and does not provide clear instructions, but the overall structure and heuristic firings point towards a malicious PDF designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a23351d6e---65941611085.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hq7upf4q8i08qmpsuvc62omc47/xebajexi.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mhrjhpdv9qv81nr2c1u777bff7/50503647066.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a29308e545---64543893154.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e31dd118b---tobovulisib.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hhd283qhn5hf152dje201ofrsr/jelido.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2ba474975---nudiwijesoxulakiwovok.pdf
    • https://advantagelic.com/singhania/downloads/file/zedudovapenido.pdf
    • http://softwarefactory.nl/images/file/34833988704.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3dc99068---65110147407.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607e484f3664a---rugomolisofezatavur.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec4f6d403e---rorofoguwag.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/badf4dd114a02efa4db6fbdbb8ae7595/55287854487.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddc5ab9830---37902951717.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=continuation+sheet+dbs+address
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23c.bin
04502feff29a12d458d74e8322ab364c088b4f718dcc3a0bd4e41c157a487643		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 4924 bytes
font_01_sfnt_off0000f2e7.bin
ba696bc58f68c1c0cda2b1fd2d2ab3fa92a635d1e7d0f3cf227397ed682443b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 11060 bytes

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