Malicious PDF — malware analysis report

Static analysis result for SHA-256 f818ed55b9cc8262…

MALICIOUS

PDF

65.4 KB Created: 2021-01-22 01:26:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d58e04c596acb92d0143474707f5fbcc SHA-1: eddac8ad64259805352e2be49758da4de7fe8438 SHA-256: f818ed55b9cc8262cdec07474cdf43e8b3ada513c69fe579ad76374507fd3544
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a critical heuristic firing for a PDF redirector link pointing to 'https://gettraff.ru/123?utm_term=chinatown+kitchen+west+bend', suggesting it is used for phishing or malware distribution. The document body, though heavily obfuscated, appears to contain text related to search results or informational content, aligning with a lure for the malicious URL.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://gettraff.ru/123?utm_term=chinatown+kitchen+west+bend In PDF document text
    • https://site-1171827.mozfiles.com/files/1171827/tennessee_titans_roster_2014.pdfIn PDF document text
    • https://site-1176004.mozfiles.com/files/1176004/download_prehistoric_park_builder_mod_apk_revdl.pdfIn PDF document text
    • https://site-1246349.mozfiles.com/files/1246349/android_restore_wifi_passwords.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/PJVMgf7/the_lighthouse_mermaid_figurine.pdfIn PDF document text
    • https://site-1179199.mozfiles.com/files/1179199/biverixudodavunosulisogi.pdfIn PDF document text
    • https://cdn.sqhk.co/rokunufoleti/iRg3iiH/fuseturixogokilebabaki.pdfIn PDF document text
    • https://site-1178950.mozfiles.com/files/1178950/98751300564.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/kgcjhW0/fodowumolomu.pdfIn PDF document text
    • https://site-1178518.mozfiles.com/files/1178518/rider_highway_star.pdfIn PDF document text
    • https://site-1172726.mozfiles.com/files/1172726/bijivazate.pdfIn PDF document text
    • https://site-1175287.mozfiles.com/files/1175287/81515147198.pdfIn PDF document text
    • https://site-1173528.mozfiles.com/files/1173528/kiberilepojikisoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/adding_and_subtracting_fractions_worksheets_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/celulas_caliciformes_traqueia.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/home_worker_risk_assessment_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/koperafokuvonewusezedi.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_off0000c43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43C 5100 bytes
SHA-256: 837315d2434a534d975b88fe9b1aa7d5d8dc9e17fb7dd21f82d5ecaabf269e5e
font_01_sfnt_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 10240 bytes
SHA-256: 57743f7c79936756614503f158d240d9f6bae27e10384cb436ae761d4f16bc9a

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