Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b79a9819e388ee…

MALICIOUS

PDF

65.8 KB Created: 2021-01-23 06:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0af909675a9348ea1e72639b97f07da7 SHA-1: b9ee87f5e0950e607d60ee6ea1af1a880d9f7da5 SHA-256: a4b79a9819e388ee865a4334c10971bd3844888d9ffdc65ecdf8b452b1243225
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, and one link points to known malicious redirector infrastructure. The ClamAV detection and ML classifier also strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/wb?keyword=fundidora%20monterrey%20pista%20de%20hielo In PDF document text
    • http://zuluwana.iblogger.org/24644539811.pdfIn PDF document text
    • http://katowad.22web.org/cerebral_palsy_idai.pdfIn PDF document text
    • https://site-1252793.mozfiles.com/files/1252793/among_the_sleep_game_free.pdfIn PDF document text
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/nivexirizol_pabowalafiwew_xetugazisug.pdfIn PDF document text
    • https://site-1168233.mozfiles.com/files/1168233/fitobumezurop.pdfIn PDF document text
    • https://wavamabixalovag.weebly.com/uploads/1/3/4/5/134525364/galixiwuwog_bepure_mitalepoju_xakaz.pdfIn PDF document text
    • https://dumugukof.weebly.com/uploads/1/3/4/6/134647937/wokon.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/1058491.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/qtVgfxF/54601034554.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/hijeJjg/clash_of_lords_2_espanol_mod_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/d2ggWhf/19198907434.pdfIn PDF document text
    • https://site-1256780.mozfiles.com/files/1256780/soxefufotagowuv.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/gazivemon/jaspersoft_report_default_date_format.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/20539241823.pdfIn PDF document text
    • http://vonupov.epizy.com/zezixodunulubobativ.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/jefasexorekabagezebov.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/18848874424.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_off0000c3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B6 5256 bytes
SHA-256: 416efddbe0ed5b48b0d998a75062186ee539584c95552ae7a43d9ddfae7229e6
font_01_sfnt_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 10884 bytes
SHA-256: 33b26f9a6c39983c62b0430c384a736513909fa83c2cb17b5bb6512832f1d36e

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