Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f07e683b6de0c8a…

MALICIOUS

PDF

76.3 KB Created: 2021-02-12 02:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 054000000055f399f90414f2c36084f9 SHA-1: 333b0e79daabd6169a5db79a0ce03aaa0a62111f SHA-256: 3f07e683b6de0c8a823d62d040216d53c0b9abfce5f262d98be0e3fae58af09a
156 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 0.9998

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://crophysi.ru/123?utm_term=bangladesh+student+association+in+india PDF link annotation
    • http://muvubaziforobe.iblogger.org/43524160698.pdfIn PDF document text
    • https://rodinesupogoj.weebly.com/uploads/1/3/1/3/131384539/89cba5e89.pdfIn PDF document text
    • https://pupiwukonavi.weebly.com/uploads/1/3/2/6/132682553/3d7cb9.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/4iihhgh/18241977903.pdfIn PDF document text
    • http://zoluvukabufe.iblogger.org/85673409563.pdfIn PDF document text
    • http://pozuliruz.iblogger.org/12825836112.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/248623f84bb64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomogas/938920974.pdfIn PDF document text
    • http://sedobuxekazadi.rf.gd/uefa_champions_league_2019_games.pdfIn PDF document text
    • http://wuzapulemukepux.epizy.com/drown_bmth_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/87339722487.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/81102679812.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/minecraft_windows_10_maps_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/26103518704.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/33594041565.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/medical_consent_letter_for_grandparents_template.pdfIn PDF document text
    • http://fejukuvazov.rf.gd/58285151624.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/delakenuvunuto.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/theory_of_symbolic_interactionism.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_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 5152 bytes
SHA-256: 3286f6f554950140e4f2c7e043431bcb2e2747acf63dcbad29efa41d6b04b570
font_01_sfnt_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 10656 bytes
SHA-256: b3313b950f997b2c28b1eddc6378478582811cbf6982f5fbfa3d06ffecaf2196

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