Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acedcce5b09b039…

MALICIOUS

PDF

61.8 KB Created: 2020-12-30 14:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ff17b14dd8a5c8f9d570f142d8e88e78 SHA-1: eb2ac16d72881a6b2ce278f857e736562c9f416a SHA-256: 9acedcce5b09b0394e08a4f9f72e5eb35915bb5216c539377f5902d51a62bfdd
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by heuristics as an external URI and flagged by a machine learning classifier and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to an 'answer key', indicating a phishing or social engineering attempt. The presence of an external URI and the overall malicious classification strongly suggest an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?utm_term=independent+variable+and+dependent+variable+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/dajebala/QbnL0ie/guess_the_emoji_movie_level_25.pdfIn PDF document text
    • https://cdn.sqhk.co/kokuxisa/djbihia/brilliant_define_urban_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/jlVZpjh/79515382408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_5fab27448ba63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490266/normal_5fcb9db641f48.pdfIn PDF document text
    • https://cdn.sqhk.co/kuruwoke/aShdAgc/water_parks_in_orlando_open.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/nisoxow/23911918546.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/55289351317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e740c6-264e-4dfa-a39f-a41b740e34f1/trials_frontier_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/master_of_the_mask_kdrama_ep_1_eng_sub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de13eac5-95cb-4634-83d3-29469f58bf7c/80101445047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d51d042-17f0-42c3-9c0c-8c10fa549544/final_fantasy_xv_guide_piggyback.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/zokez.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_off0000b525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB525 5444 bytes
SHA-256: fdc66fa2b87bcef7913549b7361685f5af4b5177edc0eae16da7e30227cc3c6b
font_01_sfnt_off0000c7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B2 10080 bytes
SHA-256: f789e3034c656acfb6f58cc6334bb31ac31e5767f68980afa3ecfa3a420a07aa

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