Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ae6d92cf7c6fd4…

MALICIOUS

PDF

72.8 KB Created: 2021-02-25 12:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 033a7f9cc162a50317de4b2026ae70a0 SHA-1: 568cd9815a19e0f0b385344919208ecb106fa1f3 SHA-256: d4ae6d92cf7c6fd45266f3296612edbe4a36dab15553b7c400678a089b729ddc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. The primary malicious URL identified is 'https://baarspo.ru/strik?utm_term=guia+de+calculo+diferencial+e+integral+pdf', suggesting a lure related to calculus documents. ClamAV detection and ML classification confirm the malicious nature of the file, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=guia+de+calculo+diferencial+e+integral+pdf PDF link annotation
    • http://how2clever.com/dr_seuss_how_the_grinch_stole_christmas_full_movie_free_downloadwqk2k.pdfIn PDF document text
    • http://trellos.fun/67668825336q12wt.pdfIn PDF document text
    • https://wididalinur.weebly.com/uploads/1/3/3/9/133986726/b6b125d31.pdfIn PDF document text
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/ee143cac30c386.pdfIn PDF document text
    • http://usecabinets.xyz/gregarious_definition_vocabularygdk9q.pdfIn PDF document text
    • http://fivabigenarewo.22web.org/85913804853.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tobobuximalusu.epizy.com/xufijad.pdfIn PDF document text
    • http://soreras.epizy.com/bbbp_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/silapusajabokigexa.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/gantt_chart_calendar_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/clue_junior_game_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/tisaxumip.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/quinta_directiva_blanqueo_de_capitales.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/help_a_reporter_out_login.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/61176008105.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 5176 bytes
SHA-256: 6db63e8719b535a9cd37d183d2956e8c7a3ac11c996bddc157fa6581f3541048
font_01_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 12012 bytes
SHA-256: 2464023acdad79c4c22b2002375213eda10fa9285cf9f5caf31eca93d688bbcb

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