Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a38ca1760091dc5…

MALICIOUS

PDF

76.5 KB Created: 2021-01-05 16:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a8c862257193ea29746ee62e2e44bb33 SHA-1: 0fe6d979fb50b49a060013ff222c7915a50d3ded SHA-256: 2a38ca1760091dc5283106154e4d014a1ca3d8469f097bb6f584f53627ad5418
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a URL that leads to a malicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to educational activities. The presence of an external URI and the ML classifier's high confidence score indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=guided+reading+activity+21-1 PDF link annotation
    • https://cdn.sqhk.co/bitizulokiva/1pVhfUA/facebook_login_desktop_website.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bewibiwat/brindisi_report_cronaca_san_pietro_vernotico.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/43869185531.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/singular_and_plural_sentences_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/vuzinelupozuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91bad5e-2bb3-4d39-84d6-a90f578054a3/figurative_language_lesson_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0884a324-a9c6-4e09-844b-2155b7cf050c/typewriter_sound_effect_imovie.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/zugedozufologekigamolum.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/dimensional_analysis_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/nodoja.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/eve_online_ore_compression_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/athens_city_school_district_tax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf077eaa-7f22-40ea-92cd-a24f989c49d0/sizuriluradotorofuxix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/890b38a1-5738-4ec8-b387-1e18489252ba/davakebekesupok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 5080 bytes
SHA-256: b1c97c466acb45cb0b375ca6d489251dbff5ee5a67f6487aad1823b7f707050f
font_01_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 10532 bytes
SHA-256: 52895df4410d6a67d63810100ff5cb7ff8dc968c9c0752b8a78d8eb2d6718e2f
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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