Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e941412575a66e…

MALICIOUS

PDF

72.2 KB Created: 2020-11-16 23:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b740fda66f8680c8bb8840c03276a283 SHA-1: 586ac3a477300509a97b1b3601b44714175f422e SHA-256: 57e941412575a66edf70ea1aae8403a758b829a5cb4a34ccc48de5b9ca031d08
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, disguised as a search result for interview questions. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URL suggest it's designed to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=business+objects+interview+questions+and+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f98e28e1b130.pdf
    • https://cdn-cms.f-static.net/uploads/4403804/normal_5f93e2658a178.pdf
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f872dbf69787.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bfa85ce0-2df2-4420-b3f6-9762ae29c678/92456826864.pdf
    • https://uploads.strikinglycdn.com/files/3833db6e-8093-4e5e-a3e9-ffe7c482c2e9/home_automation_using_esp8266_rui_sa.pdf
    • https://uploads.strikinglycdn.com/files/90287575-fe04-424c-915b-e6cabeffddfa/words_that_start_with_same_letter_in_a_row.pdf
    • https://s3.amazonaws.com/ronenitevodo/nice_guidelines_liver_cancer.pdf
    • https://uploads.strikinglycdn.com/files/014df881-513f-4069-b37d-afadae992bdd/guralirumanetiso.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/balanced_literacy_instruction_a_teacher_s_resource_book.pdf
    • https://s3.amazonaws.com/kigavanus/removing_a_curse_in_5e.pdf
    • https://uploads.strikinglycdn.com/files/69f90bb4-e0dd-4ec9-b746-c1f71e8d471c/jipigedabofupezaxoketewe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd41.bin
871d2c210939348ce356e3a70b57449528128c27c929edb88a20b44752f43648
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 5660 bytes
font_01_sfnt_off0000f0a8.bin
822ba41e6f041144892f6bf5530cf35ba265b45b8cd970830f5d62f95d473c07
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 10228 bytes