Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c0a6d7b4303716…

MALICIOUS

PDF

61.7 KB Created: 2021-01-10 22:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 817cdda2a60c40f4553893efb5e3386c SHA-1: d15c50cf56ce4432a393c9c1686ff5766184ceb0 SHA-256: a9c0a6d7b430371685fc0ecdf1ab75bf423e9bc99247ba463a18bac43478abc8
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector designed to lure users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://cctraff.ru/123?utm_term=circular+and+satellite+motion+universal+gravitation+worksheet+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4498678/normal_5fddc5a43ad35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476946/normal_5ff627319062a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409113/normal_5fcd3a92dc3d0.pdfIn PDF document text
    • https://site-1192097.mozfiles.com/files/1192097/lukutemuluwebuvuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_5faa3ab6b234f.pdfIn PDF document text
    • https://site-1183169.mozfiles.com/files/1183169/rolly_legs_apk_android_oyun_club.pdfIn PDF document text
    • https://site-1172255.mozfiles.com/files/1172255/sinatafi.pdfIn PDF document text
    • https://site-1168267.mozfiles.com/files/1168267/fox_world_series_2020_game_2.pdfIn PDF document text
    • https://site-1179301.mozfiles.com/files/1179301/zodetat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5fa1977aa08d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5faf5b96c3990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498983/normal_5fd3aad31bcf6.pdfIn PDF document text
    • https://site-1218146.mozfiles.com/files/1218146/wagorubojojadigarot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB480 5472 bytes
SHA-256: e408ad3573ae51e3051c9471887124a7c8f22c96fe83fb6d21aa964c57c2d270
font_01_sfnt_off0000c6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 9992 bytes
SHA-256: d85abbbb680c56ada74c512cd73e012db95bc02f6a9fc075f1d585e13e38243d

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