Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b4c60f1d07b355…

MALICIOUS

PDF

90.2 KB Created: 2021-03-09 02:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b605a99e070f38ac89d5c56a255e1adb SHA-1: c59c7c51752c0f5ca9952ff2c7b2839303f8db78 SHA-256: 25b4c60f1d07b3554f330abc634e15e598a86de9c742671be6d952e60c3718f0
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users by redirecting them to a network of untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/award?keyword=amiodarona+e+hipotiroidismo+pdf PDF link annotation
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/baxegodano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473384/normal_60411eae7c659.pdfIn PDF document text
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/monutukejut-vesofuxof-faduvikajumufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_60278be88bb6f.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/530998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_6046b6d8b5bb3.pdfIn PDF document text
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/06a7cad.pdfIn PDF document text
    • https://makesagesuli.weebly.com/uploads/1/3/0/7/130740055/6572637.pdfIn PDF document text
    • https://visegonikagade.weebly.com/uploads/1/3/4/6/134626066/kiwafifokabozo.pdfIn PDF document text
    • http://jutereli.iblogger.org/free_printable_punctuation_worksheets_for_high_school.pdfIn PDF document text
    • https://tedudizoz.weebly.com/uploads/1/3/2/6/132683188/nanawixodaxef-jarutiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466367/normal_5fc97808191e9.pdfIn PDF document text
    • https://kuwiliwal.weebly.com/uploads/1/3/1/3/131378779/afb027ba.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
    • http://jotunoxageleza.rf.gd/pulse_polio_immunization_programme.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_eeb0ff0eadc84de5888bf1f9e201f0e9.pdf?index=trueIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_63d6f56ceb8f49598c69805ed38a8b47.pdf?index=trueIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_8a339452f8fb49148251190c843d8ecc.pdf?index=trueIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_30122fc32bf547e5a8911acccd4253c7.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_fd61876880a1476bb5ce33f4d697c04b.pdf?index=trueIn PDF document text
    • http://dalotatafajadad.epizy.com/40416980890.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_5c66057be872466688ef00a8a5e95549.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_2dcf34077cbf4cb39bdea3e236ebd4cf.pdf?index=trueIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_9a468afc4b354255b74485514b2291ce.pdf?index=trueIn PDF document text
    • http://zalinejogimi.rf.gd/realidades_2_capitulo_3a_guided_practice_activities_3a-1_answers.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_3545ca20c9bb40f8b26dd64abf89c76f.pdf?index=trueIn 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_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 5028 bytes
SHA-256: 1dde981ee5224ec5e70fc7e28b8fef7f54633d50941e1088dc0333e71f6d808a
font_01_sfnt_off0001283a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 10704 bytes
SHA-256: d5a3311cc2df6615fa9883fa00e0ba0bd0f3d2422686ba10baed5ffb0cb581cd
font_02_sfnt_off00014cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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