Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43f1374389b1b41…

MALICIOUS

PDF

74.3 KB Created: 2021-02-08 23:19:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 53d5dfa4a5a230a0cbdbf814c07e17fb SHA-1: 23cbcf07b088a8604f79e90b58bed4dacadfd4fa SHA-256: f43f1374389b1b413fcc7c0c64aacace71a325c8c43f58dd7f2b070b46336a55
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious and disposable domains, flagged by heuristics as malicious redirectors and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the document's structure and embedded URLs suggest it's designed to redirect users to harmful content.

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 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.
  • 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://yafferge.ru/123?utm_term=clash+royale+witch+nerf In PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/WAjegg7/rozazagomegidokoji.pdfIn PDF document text
    • http://amaryllis.space/916540407562nxie.pdfIn PDF document text
    • http://fezigagufi.22web.org/ideal_gas_law_worksheet_1_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/xaveredero/jCgjfhb/bidiforupazare.pdfIn PDF document text
    • http://help-business-media.com/topafegufeyrsbf.pdfIn PDF document text
    • http://tenefadapom.iblogger.org/happy_birthday_mom_images_free.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/tofajekifigofameji23pxm.pdfIn PDF document text
    • http://s7hmus.org/daxezuzm6urt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vofofoduwegakuv.rf.gd/australian_donation_receipt_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/tawofunepo.pdfIn PDF document text
    • http://kiwajuku.epizy.com/batch_script_number_format.pdfIn PDF document text
    • http://bovubodomumid.epizy.com/xopuzisetirovubepunuw.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/23776484688.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/76797235364.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/ali_g_indahouse_300mb.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/vidigisaveledigisulefo.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_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 5068 bytes
SHA-256: 6e7fc3ed8a19973237cb2d3a3618e7b057a8bb322affa48e0414e0850f677570
font_01_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 11008 bytes
SHA-256: 7bd23395443358f219bcc5ffef4f946240b60fdf9fe40d3f0cdf6dce7f5d04f2

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