Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eebf1f37fa3ec38…

MALICIOUS

PDF

97.4 KB Created: 2021-02-26 18:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b88884356e47873cac1aa05db97371ab SHA-1: 04d447acc660ecb6d253f4438f91c17bfaf2b47f SHA-256: 1eebf1f37fa3ec38de9c20c164fafe7edfc99e903b09db6af0f08fcd2afae5a4
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely as part of a phishing or credential harvesting scheme. The document body, though heavily obfuscated, suggests a lure related to a 'chess tournament'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/award?keyword=rules+of+a+chess+tournament PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485705/normal_5fc5eeee3d44e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449766/normal_60220a32ec0c7.pdfIn PDF document text
    • http://boomerangoo.site/nctb_class_9-_10_biology_book3ijcd.pdfIn PDF document text
    • http://instup.xyz/what_is_the_difference_between_polaroid_itype_and_600_filmdidd7.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/idfgUid/puxufofanafosiwerep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_5ff92a5809a1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374002/normal_5ffeb4a502589.pdfIn PDF document text
    • http://magnitoli-2ekran.site/delta_blues_guitar_lesson_fingerstyle_like_robert_johnsonzm87g.pdfIn PDF document text
    • http://ch-redirect.icu/relative_clauses_exercises_with_answers_docnh2rf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_600e9c57e064b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5fde58f3f0c8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5ff27fda298af.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/zukogi/rujogirelafiresakajud.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/50781732718.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/fopemozilixekesomuseda.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/48291467153.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/40k_ork_codex.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/video_editing_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/47298081178.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/computer_basic_course_notes_in_nepali.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_off000142cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CC 5128 bytes
SHA-256: c588064438d2cb065f1836e0b6a7bc945bf961d881ef651942fe9c8fa3fca039
font_01_sfnt_off00015419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15419 10592 bytes
SHA-256: 8831f1750d8943061910d15a12ea08143ce0946300a454c85817eb038e71aff4

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