Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d38303c9f82ba0…

MALICIOUS

PDF

81.2 KB Created: 2021-04-02 09:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 523e403893d822ef1451043850036b5f SHA-1: 67fbf4319d4159c60a0c5172459e6987a6290140 SHA-256: d3d38303c9f82ba04d00f686838e889b93d557c6331c9b4429b91cbcd4d7c47e
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains text related to 'applications of statistics in computer science pdf', suggesting a lure to disguise the malicious intent of directing the user to the external URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/award?keyword=applications+of+statistics+in+computer+science+pdf
    • https://cdn.sqhk.co/dizoketa/jhaUjbc/dream_daddy_joseph_wife.pdf
    • https://cdn.sqhk.co/guranotup/H0nRhgb/fun_facts_about_earth_moon_and_sun.pdf
    • http://nosilekexiwot.mywebcommunity.org/68952897454.pdf
    • https://cdn.sqhk.co/tivinarafuvu/fjedifP/zegebavixu.pdf
    • https://cdn.sqhk.co/niwonosorude/khfhf0w/13506690657.pdf
    • https://static.s123-cdn-static.com/uploads/4384645/normal_5ff97bdabae7c.pdf
    • https://cdn.sqhk.co/nodezaneripe/jcCjehe/pinoy_hd_online_free_streaming_movies.pdf
    • https://cdn-cms.f-static.net/uploads/4496148/normal_5fd32f09d139e.pdf
    • https://cdn-cms.f-static.net/uploads/4427498/normal_6044fb1d88a72.pdf
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5ff06a508d9d5.pdf
    • https://static.s123-cdn-static.com/uploads/4485800/normal_5fc9efa51f939.pdf
    • https://cdn.sqhk.co/risejesob/jMiaJ4i/never_have_i_ever_netflix_parent_review.pdf
    • https://cdn.sqhk.co/zubavagi/ZIBgfIB/crossword_solver_thesaurus_and_word_play.pdf
    • http://zuzavepojul.mygamesonline.org/kegunidasowuzegijajotu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nononulavojiki.myartsonline.com/ccie_security_v5_books.pdf
    • https://uploads.strikinglycdn.com/files/801816d8-0930-444d-a169-231480ec03e2/7986789491.pdf
    • https://uploads.strikinglycdn.com/files/6426293e-7737-45ff-9700-d5af1a23b401/ca_drinking_water_standards.pdf
    • https://s3.amazonaws.com/xefezesebusu/german_etymological_dictionary_online.pdf
    • http://fatavetotujel.onlinewebshop.net/93600362582.pdf
    • https://s3.amazonaws.com/mijumomub/99029880712.pdf
    • https://uploads.strikinglycdn.com/files/2b8d0092-2056-43b9-b0f5-9bbd2beac4bc/is_auditory_processing_disorder_real.pdf
    • https://s3.amazonaws.com/jamuluvuvava/japexipos.pdf
    • https://uploads.strikinglycdn.com/files/9f4d0287-b983-45ad-989d-6073089cc4d6/how_to_turn_on_verizon_wifi_router.pdf
    • http://liraperuwuw.atwebpages.com/different_types_of_blood_test.pdf
    • https://uploads.strikinglycdn.com/files/1ffed927-4d58-4c4f-947d-4cffd0e3d43f/first_person_who_invented_math.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef62.bin
f1f0ba5aaa43d271f4a07050d4048723b3a5fcccd45037f4007ecb02080a84c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 5172 bytes
font_01_sfnt_off000100d3.bin
f60f01cfafc653c953d18f759d136c4f94e70a3f616e5dc3ac91f8b9773705f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 11104 bytes
font_02_sfnt_off000126ab.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 4324 bytes