Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1bbfd036f2b41a…

MALICIOUS

PDF

68.7 KB Created: 2020-12-18 08:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bda58d7b0a432f40a64d21e4f0525a7d SHA-1: e4b8546169a6510d9da4fb60184a2253e06be8be SHA-256: 3b1bbfd036f2b41a1719324970cb11986c092bfac19829bda27a3afca67e4f82
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded links suggests a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=tractor+pulling+games+unblocked
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/d20f754d67.pdf
    • https://static.s123-cdn-static.com/uploads/4495999/normal_5fcb7af91f5bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bipepezuwed/adrenaline_junkies_and_template_zombies.pdf
    • https://uploads.strikinglycdn.com/files/fd3514d3-477a-4ded-aeb7-c8438fb1709a/geometrical_formulae.pdf
    • https://s3.amazonaws.com/pisik/jinunu.pdf
    • https://s3.amazonaws.com/tetofamuxulil/82589883305.pdf
    • https://static1.squarespace.com/static/5fc519ee9698b02c7f3bc40c/t/5fcd69a9662d5e24e0b6193c/1607297449532/how_to_clear_fill_color_in_excel_vba.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5178a97599144eee07bd/1606373753269/81531052586.pdf
    • https://s3.amazonaws.com/xarojapi/femexewizutofevegasomise.pdf
    • https://s3.amazonaws.com/dalava/ahista_ahista_video_song_free.pdf
    • https://s3.amazonaws.com/jasadavebaga/crack_photon_browser_premium_apk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c32a.bin
efac31e95246e4e31b5ff85c48a2f5021f17930e341d1c8ea03eb0758a59197d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC32A 5544 bytes
font_01_sfnt_off0000d5e2.bin
40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 3720 bytes
font_02_sfnt_off0000e144.bin
885752b09dfcbb6b010c71ca8379413a7281854a537ec4439dc990bbfd219c93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 10804 bytes

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