Malicious PDF — malware analysis report

Static analysis result for SHA-256 419bf8243952ccee…

MALICIOUS

PDF

74.1 KB Created: 2021-03-22 00:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: db987717d3590eb817df5285f9327e12 SHA-1: f2baf745ef0f907536d2c7b61eacd0e5b4ab1f4b SHA-256: 419bf8243952ccee0332ee3acf68b1668bad3374b6c25ae5380a49385887aa54
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it contains malicious content. It embeds numerous links, with at least one pointing to known malicious redirector infrastructure at 'https://yafferge.ru/strik'. The document body, though heavily obfuscated, contains text related to 'How to add a picture on snapchat', suggesting a lure for phishing or malware. The presence of multiple links on disposable hosting further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?utm_term=how+to+add+a+picture+on+snapchat+from+your+camera+roll In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481272/normal_5fd9baa963ee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501789/normal_603ceb2cd82e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401558/normal_603c27e4014ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416513/normal_5ff255bfb69fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471096/normal_6008db44d4bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_6050712be6301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_604ecc7916b65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxixeg.epizy.com/granny_mod_new_home_apk.pdfIn PDF document text
    • http://jowekenivuzex.rf.gd/gobanifirexesufajojib.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/vegibuvozumodemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e517ec-667a-4057-9a30-f1b7339e7773/the_wonderful_story_of_henry_sugar_review.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_22edc038054e4324822f07fe3fc99979.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_8f90375665b34e7593e7de6e52621f17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakef/66774525982.pdfIn PDF document text
    • http://dibirat.rf.gd/first_book_of_ansi_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4651eb1-f6dc-4dad-aac4-c63f3e6ca271/how_do_density_dependent_and_density_independent_factors_affect_population_growth.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/nulalelowajogebofa.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/the_crucible_character_map_worksheet.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_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 5552 bytes
SHA-256: 9c234671e2d07dfced11be4b778d7fc816cb3d31a6a8977a169e3d53cf4007a5
font_01_sfnt_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 10696 bytes
SHA-256: 0db10f9db0d9bb08e68325cf51877bfc53707b1f798cb208f5a10b598063f0b4

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