Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9f8766709b0377…

MALICIOUS

PDF

87.2 KB Created: 2020-11-25 02:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b85474144308a098483de1ec80a7ef3 SHA-1: 1ca8932125bb53c4e28f327c8da615ce28be9bfc SHA-256: 3b9f8766709b0377c93e9b8bd29234091e440357e2ac10be4fc2e0fabc4418df
214 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, including a known malicious redirector. The heuristic firings indicate that this PDF is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. The presence of numerous PDF links suggests a link farm or a method to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=pokemon+battle+text
    • https://tokuzowavabiv.weebly.com/uploads/1/3/4/8/134867887/5c5f8b7575eccb.pdf
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f894f8453aac.pdf
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/juguti-bokajaserak.pdf
    • https://sasikivi.weebly.com/uploads/1/3/4/4/134462450/f16718.pdf
    • https://xuduburuk.weebly.com/uploads/1/3/4/3/134323667/bavebabivezava.pdf
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5fb5d2c894e12.pdf
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5fbd8dda3e20a.pdf
    • https://numomepezudoti.weebly.com/uploads/1/3/4/3/134320197/8804141.pdf
    • https://cdn-cms.f-static.net/uploads/4424011/normal_5fbd968d2d5e3.pdf
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5f8c2d058126f.pdf
    • https://gazisaki.weebly.com/uploads/1/3/4/3/134371182/pifaz.pdf
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/nifeda-bibofafonupati-kavoxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/927a0f39-6b2d-4db6-99bf-a4c28a75d4c1/nonlinear_systems_khalil_-_prentice-hall_2002.pdf
    • https://s3.amazonaws.com/ravuxudibure/cinderella_story_summary.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27d.bin
326f6094a033271531087c50fe475a7e01fe4e8e0bf131b5b1482729c7d092b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 7040 bytes
font_01_sfnt_off00010a8c.bin
fb4ae80b2bc7542b6cf5ee9367306a739d617c710c7023bc923ded21977d50d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 4832 bytes
font_02_sfnt_off00011af4.bin
f969193f33711d8bf9a0a1fb18e7c8ef9897b879abeed85f50b14f56caa2d651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 12296 bytes
font_03_sfnt_off00014140.bin
c074c5846876e7efeedeaeab1d6a7e28e13b7d6ffed034a39e2b1a3b1a9cb6f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14140 3272 bytes

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