Malicious PDF — malware analysis report

Static analysis result for SHA-256 e424bd74abd048d2…

MALICIOUS

PDF

76.7 KB Created: 2021-01-03 12:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bcffdbccbc7209182e59a969c7628c44 SHA-1: 964e5e188e4f6f31276aa613010edabcc5fc2676 SHA-256: e424bd74abd048d2d3f74fbc184f1cd73bb2f1cb43f891209df23c218338a6df
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'https://trafffi.ru/aws?utm_term=alternative+chat+app+for+android', suggesting a phishing or social engineering lure. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a document. The presence of multiple PDF_URI and EMBEDDED_URL heuristics further supports the malicious intent of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=alternative+chat+app+for+android PDF link annotation
    • https://cdn.sqhk.co/nopawuwam/Q9gjcid/baribudokuvibakod.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/eWEPgeW/nivebanavofujomegena.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/bokibuxogalot.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/34595708fc3a3ae.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/faZhhCf/22671886868.pdfIn PDF document text
    • https://kitafawavan.weebly.com/uploads/1/3/4/7/134702073/jonegomelad.pdfIn PDF document text
    • https://cdn.sqhk.co/wirumedaba/jhfiiih/27276833542.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/362c7585-f772-47f8-bc83-703dc53e74fe/14136851786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/241db210-9dc8-45e1-a639-0c58e12a744e/jozulakijuzawasiwati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d329ae1-7382-43fc-8696-ea0c10d13468/breath_of_the_wild_shrine_guide_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/jimubopor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3d04ac-4055-4914-85d3-54b1ba94da5e/15451932641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ff3fb1-b47d-47f2-acba-186ad661850e/el_yunque_werevertumorro_golpeadora.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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 5112 bytes
SHA-256: b1127d498f940fd8b7a6b4f7bfc88da7d8a645be42801a3e7c5d390a4adde861
font_01_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 11180 bytes
SHA-256: 91d56f454d17514fc43c0c033fa260cbccac5884d34ae84faf506a48448d1a79

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