Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6e33d1a1f85283…

MALICIOUS

PDF

74.4 KB Created: 2021-04-08 10:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cba4ff18dade0a88caf445aa389185e SHA-1: 45b358065e1c5567fabef7c3b9b1e974a8649539 SHA-256: 6a6e33d1a1f8528312cd5bd0c1b7ae6f3f5614d8df03dca8256e89093d2f8b76
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL that appears to be part of a phishing or malware distribution scheme, disguised as a worksheet. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/wix?keyword=cell+organelles+riddles+worksheet+answers
    • http://websporizlehd.com/wizkid_superstar_album_ziprjvp9.pdf
    • http://about-igsupport.com/what_is_safety_training_definitionqywd1.pdf
    • http://tryporte.xyz/numbers_in_german_1-_10009p5yt.pdf
    • http://sputnews.com/chengdu_china_weather_report0ntqz.pdf
    • https://cdn.sqhk.co/vagekasip/jf69xJt/zutuzulifakoj.pdf
    • http://hocostyle.ru/wukexudedonasunu3ryrv.pdf
    • https://cdn.sqhk.co/vozaxodep/wJOijBp/zefonivuz.pdf
    • https://cdn.sqhk.co/tinolaseja/f78gejc/pumib.pdf
    • https://cdn.sqhk.co/vobipibomuk/gb1jcfj/quillbot_premium_account_username_and_password.pdf
    • https://cdn.sqhk.co/pelebitebi/gfOqm34/health_economics_jobs_los_angeles.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sorogamat/35519054396.pdf
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_11d37a2a56084581aa5d1c64155548fd.pdf?index=true
    • https://s3.amazonaws.com/tarajix/gujaxukuvur.pdf
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_08f935ac5fa54ee6bc5f436cb8a721fe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bd34f0dc-0eef-4eed-8f4e-57e4d414379c/97420178188.pdf
    • https://uploads.strikinglycdn.com/files/328ae6fa-ee3d-462a-8dbb-f5d8bc872d73/knife_of_dreams_amazon.pdf
    • https://s3.amazonaws.com/laginekux/excel_vba_copy_existing_worksheet_and_rename.pdf
    • http://polilofu.onlinewebshop.net/star_wars_thrawn_ascendancy_book_1_chaos_rising.pdf
    • https://s3.amazonaws.com/solonebosop/52707404084.pdf
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_4afb07f30a014e4c85ab6e1740db1e89.pdf?index=true
    • http://kapirexazi.onlinewebshop.net/bpdb_job_circular_2020.pdf
    • https://uploads.strikinglycdn.com/files/99be9447-79b0-4802-9baa-a4682cf6df03/how_to_community_organize.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e7.bin
89cf082a2247333fc8e884fa376f08bd6d017e30f3ec77c8b7246b416734256b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 5148 bytes
font_01_sfnt_off0000f86f.bin
c14af2bff54bd4eb25dc9145b463fc9210fdbc9d4680564275a1d9576036220b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 10452 bytes

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