Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7abbdbc18b7dd2…

MALICIOUS

PDF

67.5 KB Created: 2020-11-24 18:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7f2060c0c6c6326f74c100eb3f07eeb5 SHA-1: 4f1a76218255f7df5ae7b3da80e6c5f549b59b1b SHA-256: aa7abbdbc18b7dd2eaad3ee585ce8ce18a6c0040d0fb6d300619c8c7c40a184a
222 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The presence of a large number of external PDF links, some pointing to potentially benign content and others to unknown sources, indicates a link farm strategy. The ClamAV detection and ML classifier further support the malicious nature of this document, likely used as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=videoder%20app%20install%20%20iphone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5f8ddd3f2bc26.pdfIn PDF document text
    • https://gibiboxovozigux.weebly.com/uploads/1/3/4/7/134722082/pamavut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415745/normal_5fb3a0ce0279e.pdfIn PDF document text
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/bopajo_morazavoxewux_levixanuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f88091e59a21.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/jobavo/bharat_2019_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/biopsychology_book_pinel.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/kilazowu.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/multiplication_area_model_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/nine_theories_of_religion_daniel_pals.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/pajerebowifi.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_off0000ccd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD4 5012 bytes
SHA-256: 40f04b8bc01337f815a1928e4c57d3a669ae602ad1bdfefd86b0f63787fdf017
font_01_sfnt_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 10652 bytes
SHA-256: 1b5cbbf26027f3056b454cf8022d3904f20fb9f3a491d9017c890df4ea4be9ca

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