Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cba3fcc8c23777…

MALICIOUS

PDF

75.7 KB Created: 2021-01-16 00:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0ac7cc02a7da1930aab349458a50ab45 SHA-1: 7e81fbe3b8072f1678de5ef146518c61d1c8fce3 SHA-256: c7cba3fcc8c23777be98914c3b7374d61ce334ea5b476af0fabeec2776ee5999
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure (ggtraff.ru). The presence of these links suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/123?utm_term=universal+fuel+pump+for+fuel+injection In PDF document text
    • https://dinomorozowi.weebly.com/uploads/1/3/4/6/134610364/lelonixenob_rigeliri_wekesikusegosev.pdfIn PDF document text
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/87b897868.pdfIn PDF document text
    • https://site-1172627.mozfiles.com/files/1172627/train_to_gensan_cheat_apk.pdfIn PDF document text
    • https://site-1182116.mozfiles.com/files/1182116/xenisoneboli.pdfIn PDF document text
    • https://site-1176575.mozfiles.com/files/1176575/free_antivirus_with_licence_key.pdfIn PDF document text
    • https://site-1183169.mozfiles.com/files/1183169/76684274358.pdfIn PDF document text
    • https://datotizit.weebly.com/uploads/1/3/4/6/134696706/basutoriduj_mimivufete_zenokufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5ffa27acabb95.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/523285.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/tugumeb/academic_performance_indicator_api.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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 5288 bytes
SHA-256: 9db86a832299fc6e799cb4e152210e9c0f315a4788d4ca8d2e47040173b611e6
font_01_sfnt_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 11140 bytes
SHA-256: 916098192a3bb7528bf5679743adf1d52a26d01ebeffb6ec86a96ada9d17dd2f

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