Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8daac180ea6cb5…

MALICIOUS

PDF

66.3 KB Created: 2020-12-21 21:03:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 64711647f797933fa214256157397b87 SHA-1: bace939e61e06bc1a7ebde3025123d3ddf424b03 SHA-256: ca8daac180ea6cb5f6e6022577a3a0d2f984d2bdcc57c5a02418e546768f2a36
96 Risk Score

Malware Insights

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

The file is a PDF document that contains a malicious ML classification score and a ClamAV detection for a phishing trojan. It embeds a URL pointing to 'trafftec.ru', which is likely used to deliver a malicious payload or conduct phishing. The document body is heavily obfuscated, but the presence of external URIs and the high ML score strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://trafftec.ru/strik?utm_term=marshmallow+lock+screen+prime PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6070c0-9c3c-4a30-b86c-0361eda544fd/53471592226.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/clsi_guideline_m45.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b268a699-c476-4749-accd-207bf692fdf7/6992484808.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11628df132613bbbed3cd/t/5fcddabac00f007cea0a3162/1607326394895/rebel_cops_airport_codes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4bfa2bd14ff0dd2b5522a/t/5fcbc5abb495bd202829c0cd/1607189931957/soccer_world_cup_qualifiers_results.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7806bfc603311fbfaad69/t/5fd61d805b1f6f7539cece07/1607867777153/baked_lays_potato_chips_nutrition_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76fa5a33-1810-4860-a0d0-03c74726c099/them_book_joyce_carol_oates.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/fasenivujavobidafaxi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc68db56609fd0ee7b8a05a/t/5fd5f89596ed101a3e3560f5/1607858326449/angular_4_template_form_example.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce0e7fe5cb4c30585dce04/t/5fd11b740d627f5be3974e40/1607539573424/51379794685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35cba9eb-65b0-4fb5-b5cf-4417ee94ba6a/nikonos_zu_verkaufen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc97b8e1-a0d6-4461-bd7d-3e54e763def4/jijuxazo.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/27709064637.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/basilea_3.pdfIn PDF document text
    • https://forums.androidcentral.com/showthread.php?t=663845&s=aac041f7f5d9db326dacff53b8f3e02aIn 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
    • https://forums.androidcentral.com/showthread.php?t=663845&s=aac041f7f5d9db326dacff53b8f3e02aIn 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_off0000c5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DF 5336 bytes
SHA-256: 4bdb3fb9fe5e6bf536ecaa777eb8301b0bb333114d0d394ade3208da14f3bb80
font_01_sfnt_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 10724 bytes
SHA-256: 3f54ec0a2527b35b5da7d9335646eda6f7421e8b5b37a6ac708cc36e7de3ba1e

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