Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b847283cfb53ee…

MALICIOUS

PDF

93.5 KB Created: 2021-03-16 19:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92efd89806aa3c6aa82eaa770ee3e445 SHA-1: d6b62d0dc5460a1bf61bd9c5613957ea2a6c8878 SHA-256: b0b847283cfb53ee55ec5c3d2b0defd50f17e5c252e0a29c23ef6ec244b345a5
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of an SEO link farm designed to drive traffic to other PDF documents. The 'ML_NYX_PDF_MALICIOUS' heuristic and the presence of numerous unknown reputation URLs strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'Showbox apk 2015 download' and 'wkhtmltopdf', indicating a potential lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wix?keyword=showbox+apk+2015+download
    • http://fusekimutoxi.sportsontheweb.net/65369315801.pdf
    • http://gufebuxixubo.iblogger.org/decimals_worksheets_for_grade_5.pdf
    • http://zexawabezazojot.sportsontheweb.net/bestiario_pathfinder.pdf
    • http://surupumigo.mypressonline.com/xbox_a_button_stuck.pdf
    • http://vekowen.getenjoyment.net/jojokexotufekujug.pdf
    • http://wunegaxuduru.22web.org/2005_cadillac_cts_for_sale_in_saskatchewan.pdf
    • http://fupemagis.mywebcommunity.org/someone_like_you_piano_chords_ultimate_guitar.pdf
    • http://lufexaxoxak.mygamesonline.org/conversion_of_fe3_to_fe2.pdf
    • http://dosaxixapaxa.medianewsonline.com/2468854481.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_fd5d42fd8d684e458189f9944aeb4d26.pdf?index=true
    • https://s3.amazonaws.com/pasawe/gaggia_classic_pro_2019_review.pdf
    • https://s3.amazonaws.com/wujanozo/abinaya_mugen_rao_free.pdf
    • https://s3.amazonaws.com/badodemebo/gesakimatedadufuvaza.pdf
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_eda2364b8e04405cb80e179fd39a6674.pdf?index=true
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_6810a5c03f5549aca2ad1ea1e3258a77.pdf?index=true
    • https://s3.amazonaws.com/wamatasamegu/fividegasisuvupuf.pdf
    • http://soranodabiwegi.myartsonline.com/89941152189.pdf
    • https://s3.amazonaws.com/fekife/33305562514.pdf
    • https://s3.amazonaws.com/jusuberu/bullet_raja_movie_hd_video_song.pdf
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_ca99aa68b8f141deaf85140fcb1266d2.pdf?index=true
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_eefc2ee93c2b4b198e4f114b96870548.pdf?index=true
    • https://s3.amazonaws.com/vezumobigodub/35124392908.pdf
    • https://s3.amazonaws.com/kitakilesa/94_game_answers_things_associated_with_brazil.pdf
    • http://wowulikuvej.rf.gd/mcgraw_hill_education_algebra_1_answers.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_off0001304b.bin
2ce9e8532cee19a10a4d6b340a8288376c8ba4f9e9e65c5b278bdfedc3e20e85
pdf-font-stream PDF embedded font (sfnt) at offset 0x1304B 5688 bytes
font_01_sfnt_off000143c3.bin
70d7bf87483f6ec4ff44351887e123e9264c3c1a619bb61c10585982cff524a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143C3 10912 bytes