Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b21979d984bdf74…

MALICIOUS

PDF

84.9 KB Created: 2021-02-16 13:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a204e09d294e9bb117218ee89287ed8f SHA-1: 56bf2d62e1b94753014b177c72ab60d550c16fd2 SHA-256: 9b21979d984bdf74cc24aa5b9bfd6fb20ddbe276006ad28e4e245aa6a06a64ab
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a known malicious redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using disposable hosting for a large number of links, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=vfw+auxiliary+bylaws+and+manual+of+procedure In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413702/normal_602a112a7414b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477877/normal_5fe393503e83e.pdfIn PDF document text
    • https://jeludumekidi.weebly.com/uploads/1/3/2/7/132740852/b9344f0fcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450350/normal_5fec08bf947b9.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/hzsmK81/lose_weight_success_story.pdfIn PDF document text
    • https://vematonejos.weebly.com/uploads/1/3/1/3/131383464/pinaf.pdfIn PDF document text
    • https://jetetinabalu.weebly.com/uploads/1/3/2/6/132682142/virise_jileju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_6009fe1753033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_5fdbe3e82d95e.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/9127528.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gusufarafedi.epizy.com/wallpaper_photoshop_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/android_studio_appcompatdelegate.pdfIn PDF document text
    • http://nemusif.rf.gd/solar_energy_journal_guide_for_authors.pdfIn PDF document text
    • http://pojafuda.rf.gd/documentation_sample_report.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 3148 bytes
SHA-256: 1ef4733febd38295b22b6bb246f8427f475a2da87746bd60a28d1afbef0fe8d8
font_01_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 5668 bytes
SHA-256: eb99c4ff3822dc9ef1477cee5228c14ad8deae6c5f10bb05a2c3b793f8839a8d
font_02_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 11424 bytes
SHA-256: 02e84e93d8ac5d35cb12a2b65fbb7759a8810f6c6d4980656cac1e921aeca52a
font_03_sfnt_off00013002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13002 16184 bytes
SHA-256: f7d18df5b2749ef38f3c5abee31f46fad06243e1ea23181be4889499f2e53b69

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