Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd243e155a4ef62…

MALICIOUS

PDF

79.1 KB Created: 2021-04-06 16:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ca4038d7eaf87b05dabebf6fa5e21c71 SHA-1: 5097fc218486d73bd42995c047534d80638eaa90 SHA-256: 5dd243e155a4ef62524c60b229924ec57c0a88641aa3144a545025281c0f8769
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/award?keyword=annelida+adalah+pdf PDF link annotation
    • http://fonixeguga.mywebcommunity.org/libros_sobre_el_anarquismo.pdfIn PDF document text
    • http://dusamoka.mywebcommunity.org/latitude_5490_spec_sheet.pdfIn PDF document text
    • http://robinmani.site/examenes_cae_resueltos9d3wz.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/dunexodeposum_lelit.pdfIn PDF document text
    • https://tiledumojamusej.weebly.com/uploads/1/3/4/0/134096308/da687681d271a.pdfIn PDF document text
    • http://vowuzemiru.medianewsonline.com/arthritis_research_uk_ankle_exercises.pdfIn PDF document text
    • http://naturaleone.space/yo_amo_a_paquita_gallego_castwu619.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/e46d186.pdfIn PDF document text
    • http://burrrhey.tech/nfl_bettors_guide_week_1xd6yo.pdfIn PDF document text
    • https://gexokatex.weebly.com/uploads/1/3/5/9/135960098/6405234.pdfIn PDF document text
    • https://batebabegusuk.weebly.com/uploads/1/3/1/4/131437625/vupoledanuxubineriv.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
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_77676b9717f34f9da2c92e3409674496.pdf?index=trueIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_ea3bd3a524d6403890ae96e43ffd57e5.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_af2ba0e51bfe4b29b274aa06b58032ab.pdf?index=trueIn PDF document text
    • http://lewinozed.atwebpages.com/fundamentals_of_accounting_book.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/fire_emergency_drill_report.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_ba72baefb27340e4bff3cfb9fcd96c75.pdf?index=trueIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_a3546a4b489a4bf4bc98522cea469ad8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/irrational_numbers_worksheet_answers.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_8cfdb33373e448ecbf68c2f6ccb8ec14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/chemistry_interview_questions.pdfIn PDF document text
    • http://fowakoleviwamop.onlinewebshop.net/64957607658.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/plan_y_programa_2011_sexto_grado_primaria.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_9358784cd1c94bcabef54b3cdbea7c39.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_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 4444 bytes
SHA-256: 9054de939f816914010ddedc93abedc9ae79c2acc77f7d176c9e0b15a626c353
font_01_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 10300 bytes
SHA-256: 1a02ef54163b808f8e0e3dcb7fc017c4f3240da11a23cdb4485931db6735107a
font_02_sfnt_off000120f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3