Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c71f7115c4f4f0…

MALICIOUS

PDF

97.5 KB Created: 2021-02-18 10:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4c1597034d0229a83c1700d1fd9299c9 SHA-1: 94fb7a349a3b12390225da7e53a9f86af164d0f7 SHA-256: a4c71f7115c4f4f03a4023418d71583605999c20ffaa58f5327cf337331ca847
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to legal documents, which is a common tactic for phishing attacks.

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://jacksth.ru/123?utm_term=clasificacion+de+los+contratos+derecho+civil+guatemalteco PDF link annotation
    • https://cdn.sqhk.co/sebutarukaw/fdheRhd/stickman_warriors_online_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vifekodilevi/izQhagc/how_do_i_lose_belly_fat_overnight.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_5fd6ad7b00a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_6010cc34f0a6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460449/normal_5fc9519dd3ca1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527042/normal_5fdd4322cde68.pdfIn PDF document text
    • https://cdn.sqhk.co/juvosuneni/iePvgjv/xibaga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457570/normal_6004e5bc31344.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/iaRBhid/good_life_project_podcast_host.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/iehaVIF/waborovimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_60295235d13c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_5fd8d595b65d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452626/normal_5ffeee2a4ea27.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/1dhcqhc/netflix_movies_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/iejjQge/gamer_chat_abbreviations.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451045/normal_5ff7fef5bf9e6.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/fupanabivote/jinja2_template_python_code.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/coorg_travel_guide_quora.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/heathens_easy_piano_sheet_music_roblox.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/26178806020.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/resident_evil_4_ps4_weapons_guide.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_off00012f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1F 5400 bytes
SHA-256: cdba06ca815903f5f031518f00efd4b89fcf85a83c588fd8794efeb293c4d8eb
font_01_sfnt_off00014152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14152 11912 bytes
SHA-256: df6662462f31ef186856cf169f8d722fc650e578c392325a9a1db2cb1d1dd58b
font_02_sfnt_off0001682f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1682F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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