Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7cf4ea5c66b2ae0…

MALICIOUS

PDF

85.2 KB Created: 2020-12-22 02:36:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ef4837a781ed838a35a9b800a6c92fe3 SHA-1: dd363d6ce8d23e773dcf1dffa7ae4bba6e2888aa SHA-256: d7cf4ea5c66b2ae0d192b4b5b5e1b621c29d896582f6242e3afba366be043a70
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The file contains a large number of embedded URLs, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ggtraff.ru/aws?utm_term=stocks+portfolio+template In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f89cd53844a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5fbdeefb2b6e4.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/152018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fe11f846e5d8559946c89f1/t/5fe1375815fce75a50de70c0/1608595289356/escape_room_level_115_answer_word.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/tamevolafadedeko.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13405bdb33045eec44b84/t/5fc5c1f33570fb44d1ca6595/1606795763494/55426893054.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/sobizi.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/98757934320.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/death_on_the_nile_2020_cast.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea21c30a162e0c52977d/t/5fc1c4943570fb44d1447716/1606534293335/vista_20p_programming_cheat_sheet.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_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 5328 bytes
SHA-256: b7e2aa2b3b66a2d3fb8d9c3ad959fb7560ee3588c5ae7933659b5186747ceb58
font_01_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 11912 bytes
SHA-256: 80a68bfcf0fb53cf451b8c5be9a0f9069f9ca7afba4e1f7a92d55a82ed885ce8

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