Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddebdd92442bb83…

MALICIOUS

PDF

69.3 KB Created: 2021-01-11 10:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 68764de29a3c8739556751dbfffb1c27 SHA-1: 2b5a835abba0d0224b676629ba6679779bc4823f SHA-256: 9ddebdd92442bb83df65d64a8dbe29530fbbfa19ce0e78827b02e4369b70ddca
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is a malicious redirector and part of a link farm, designed to lead users to potentially harmful content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/aws?utm_term=%25C4%2587wiczenia+gramatyczne+dla+gimnazjum+angielski+pdf In PDF document text
    • https://cdn.sqhk.co/dofewijoras/idpHgi3/guzolasukuvidasiser.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/kejana-jusom-gozur-pedutotojulo.pdfIn PDF document text
    • https://site-1175991.mozfiles.com/files/1175991/93971462327.pdfIn PDF document text
    • https://site-1168114.mozfiles.com/files/1168114/98584670371.pdfIn PDF document text
    • https://site-1166603.mozfiles.com/files/1166603/totarezufaga.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/ijhihbY/72721699173.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/vavebufevodutob/gnarls_barkley_crazy_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/anomaly_warzone_earth_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/airtel_tv_apk_for_mi_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/napolidemorebaxagukufiz.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/barack_obama_leadership_style.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_off0000ccf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF2 5900 bytes
SHA-256: 129c0bce6f50019d1b39150e2641a48646b7758ad96828cdaec3b4d3ed16eaf7
font_01_sfnt_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 12176 bytes
SHA-256: c82b7a12034e64849a18f5daf741501c62dd84f74c6c1c36de4e9121dc6779e2

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