Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cd40b2c257ac18…

MALICIOUS

PDF

84.0 KB Created: 2021-03-30 22:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b4c2aa56b59b956497360a922a3b8ce SHA-1: d374f4e5311848435921bdca17ccc302f4740efe SHA-256: 89cd40b2c257ac18aa1177167d7224e9184bf371c33bfe07f458719eb559e0fc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL points to a link farm designed to host many PDF files, suggesting a phishing or SEO poisoning attack. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure and heuristics strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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/award?keyword=babel+the+language+magazine+pdf
    • http://lojuxaga.mywebcommunity.org/thanissaro_bhikkhu_books.pdf
    • https://cdn-cms.f-static.net/uploads/4444649/normal_601b9c80ebc51.pdf
    • http://zaxiluxedexu.getenjoyment.net/skoda_kodiaq_specs.pdf
    • https://cdn-cms.f-static.net/uploads/4379859/normal_6026faf5e11c9.pdf
    • https://static.s123-cdn-static.com/uploads/4449776/normal_5ffaae922a217.pdf
    • http://wivuperafuzo.mypressonline.com/bayesian_ideas_and_data_analysis_christensen.pdf
    • http://gebikomuxe.getenjoyment.net/zitewikagasuguju.pdf
    • http://bekokax.getenjoyment.net/cambridge_audio_cxn_v2_manual.pdf
    • http://ruguwafe.scienceontheweb.net/12202481077.pdf
    • http://foramodosug.mygamesonline.org/administracion_de_recursos_humanos_9_edicion.pdf
    • http://kowojolajamuv.getenjoyment.net/sijiradibawovene.pdf
    • https://static.s123-cdn-static.com/uploads/4382620/normal_5fe0599da438a.pdf
    • https://cdn-cms.f-static.net/uploads/4426550/normal_5fd85eec5405c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_1ed913f8cc3b4572ac9378c0b2d871b5.pdf?index=true
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_8b77df786aa64cbd87a239292e287598.pdf?index=true
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_2ac633ec8f1b48f2aba22b3b7cde0dff.pdf?index=true
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_1ad12e830aff4b70b3064d36d270b6af.pdf?index=true
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_502a5e315d82496fa4bf9731a4aaefbe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/014f93d3-a98a-429c-b92f-57713da3f933/vewasu.pdf
    • https://uploads.strikinglycdn.com/files/c2fa89f7-c5eb-417a-8390-fcdb8517a283/factory_reset_apple_airport_express_a1264.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_44afa6441bd6425588a0e352914266e4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/360178aa-bc0a-41ce-907f-356d0736e124/wuvufawapivasewin.pdf
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_db6133419a3f47879981dfcef40cda2a.pdf?index=true
    • https://d64d5b41-a66a-4b78-b87f-0feaf8e9cf76.filesusr.com/ugd/cf1aed_8f5b3be42fd04ad888d7e7776b544b04.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f288.bin
c9713c628502631d6bf74f564220c5026a76ef21ff9f56646ef1f298a2ca3e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 5420 bytes
font_01_sfnt_off000104db.bin
00e9a2768eb434158ccf9a319aa62af9c93ca8577a23df45c63d54b9520c7ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 11812 bytes
font_02_sfnt_off00012c7f.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 16204 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.