Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b2b8139f3ac2d5…

MALICIOUS

PDF

72.7 KB Created: 2021-02-25 20:57:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 85e8a9d360b8d6422519215a32604ab1 SHA-1: 35fd62840643d3cd0f4df13e1cc986929167d9bc SHA-256: 94b2b8139f3ac2d54c6aaff98c1a770450e99bc3d3b7cc8c17be8236cff395b3
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are associated with redirector infrastructure, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to its creation, which does not detract from the malicious indicators present in the URLs and heuristic firings.

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/award?keyword=indian+law+books+malayalam+pdf In PDF document text
    • https://cdn.sqhk.co/dizoketa/i1hjhiR/war_of_1812_timeline_worksheet.pdfIn PDF document text
    • https://kawawipebezuvo.weebly.com/uploads/1/3/1/4/131409621/8625119.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/chcjh4e/adderall_tablets_30_mg.pdfIn PDF document text
    • http://lg-copyrightforms.com/18891972772ys050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401994/normal_5fe643d3b0fa0.pdfIn PDF document text
    • https://cdn.sqhk.co/letiludixo/ijTq5ig/64280809263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415944/normal_600d14a74cbc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_5fd698b8828ed.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/hfhaics/pewefafegomekiridoka.pdfIn PDF document text
    • http://medway24.com/bahubali_2_telugu_movie_dj_songs1dc2z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474985/normal_5ff4dd4c4fe67.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/2PjbhcD/13837334417.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/AXRtgdB/7_wonders_of_the_world_2020_images.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455645/normal_5fde72627125f.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/dghaWhd/nhl_playoffs_bracket_2020_updated.pdfIn PDF document text
    • http://maykistore.ru/447766077290u9ac.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/remavuj/gesafanadariwekikajituma.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC863 5424 bytes
SHA-256: 41032ea90712a40f23a9d38b833244405649611398852d792bb26de0c4d27f93
font_01_sfnt_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 10392 bytes
SHA-256: 57c658962dc89eea8766684ddf388ed80f2533127b462d845c0b1de38d738f9c
font_02_sfnt_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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