Malicious PDF — malware analysis report

Static analysis result for SHA-256 0965f3cde5ddba19…

MALICIOUS

PDF

72.8 KB Created: 2021-01-08 04:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: de1a86e6ae21b49ccff0cf6f769c03e2 SHA-1: ce38cfc318bb7b096cb6ad0cd601978b547637d3 SHA-256: 0965f3cde5ddba19d4761aada284d6c8d9a05614debdec09061bf81c24558095
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate a link farm designed to direct users to potentially harmful sites, and ClamAV detection confirms its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://gettraff.ru/123?utm_term=serial+communication+protocols+in+embedded+system+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f924c679d419.pdfIn PDF document text
    • https://dexatasudawuge.weebly.com/uploads/1/3/4/4/134477966/radasivasidipi-tedokakixuvaf-dowilolare-gavakab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390659/normal_5fc44db5006e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454541/normal_5fc1635d74799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393754/normal_5fef8c95600e3.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/amgc7gg/23217004616.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394072/normal_5fde78703a412.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/Y7cvVrr/darenunosibixelesuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5fdb2786c5de0.pdfIn PDF document text
    • https://cdn.sqhk.co/totuzilexif/jahgvib/my_hero_academia_heroes_rising_showtimes.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/456800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_5fad3cfe97ed7.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_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 5644 bytes
SHA-256: 8719a8fde072e16cd1b92f7555bfd5e0ba7cdab84a74cf37e0195eb3e441a2fe
font_01_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 9972 bytes
SHA-256: b25d34cf82d68b6cddba22dcef9a55b925e0e366d93e8d7f6558b8ca93ad6acd

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