Malicious PDF — malware analysis report

Static analysis result for SHA-256 357143cdd33ef463…

MALICIOUS

PDF

84.5 KB Created: 2020-11-22 10:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aec8ee62d79fba7efd97bb722d1e3e7f SHA-1: 3dff38f5b533029bbc951e6b22292eaee8b77cc5 SHA-256: 357143cdd33ef46361da0f44d57ae4977b07da9abc0214c1d5b3585f650005f6
96 Risk Score

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 'trafftec.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, contains strings related to 'Microsoft Excel spreadsheet test' and 'wkhtmltopdf', suggesting a lure to trick users into interacting with the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/aws?utm_term=microsoft+excel+spreadsheet+test PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/88073187195.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/utopia_property_management_bellingham.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90057c3-d5ef-4e80-bd8a-72c680672bd4/no_credit_check_apartments_tampa_fl.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/pawan_singh_akshara_song.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/pumikix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd607d2-a0d3-449f-b293-3367bc0a8f39/84368255265.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/psychology_statistics_for_dummies_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6fbe338-4b97-44d2-8a55-3b6b5075a1e9/wimil.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/kafagimerokibime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b98612-3902-4860-b315-fd2962147e97/great_big_bertha_driver_price.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/pizza_clicker_game.pdfIn PDF document text
    • https://s3.amazonaws.com/betimugi/the_tell_tale_heart_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/skyrim_carlotta_valentia.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 5316 bytes
SHA-256: f6e9ef024cf9125b8d2d5a801e61c570b8d885f4811aec73d18f95c2af889b95
font_01_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 11448 bytes
SHA-256: 6b782d4e3450a8e025e5f705bc2fc71cd4b8aa58efa4045613a571c17d274a4c
font_02_sfnt_off00012f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F24 16344 bytes
SHA-256: 9c47a8ecf7103172530608de19fa11afb8a035ab51042e9cb8c6809f09ebb189

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