Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74220d8189b61a4…

MALICIOUS

PDF

61.3 KB Created: 2020-11-21 09:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 03ca23c3f8038447761290cd5784bf0c SHA-1: 5b9ca9b4f3576c73be8cd702ad1400c09e929c94 SHA-256: e74220d8189b61a40273c1d617f50f65447365c00c528df6adfa20369e0c04fa
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains text that appears to be a lure related to homework answers. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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/123?utm_term=customary+length+lesson+10.1+homework+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5f88fbaec2a6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5f9316ae01352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f912bad8869a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_5fb81d04eeea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426971/normal_5fa84c7b60111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5f897cd69140a.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/befevifa/word_whizzle_champion_answers_daily_puzzle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4f717c-4a48-4a07-8d92-3725f8d8c81e/65518345477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f71aff3-aeb9-49fe-b8fa-cd3c6cbffa45/95613489938.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/javascript_tutorial_w3schools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/207e9e29-6ca9-45db-91cf-ead5c9997d03/the_dark_army_starblade_chronicles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f71797f-c774-4624-8b5a-614971d8cc58/67086950313.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_off0000b254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB254 5488 bytes
SHA-256: cf1916f6e5bfa6060aa5da912b62279e1a238ab77d9c67a6c08403533f47f858
font_01_sfnt_off0000c4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EA 10368 bytes
SHA-256: dd9345f1668a92b3f4d0eee70f750dd36685bf0529ab73311adf536273d63303

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