Malicious PDF — malware analysis report

Static analysis result for SHA-256 203cd2f1cc6253d5…

MALICIOUS

PDF

83.3 KB Created: 2021-05-03 01:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58eba41875b32f2d4b230b7ffcd3e512 SHA-1: 474413a052248f740c0f9fa3085e6e221134fe9d SHA-256: 203cd2f1cc6253d5592b36488bd05de5db6bb917257a02356fe3d0dd8cc65fee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a link farm detection and an ML classifier. It contains a large number of external links, with the primary suspicious URL being https://botokaw.ru/strik. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest a phishing or SEO spam campaign. The file's purpose is likely to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://botokaw.ru/strik?utm_term=the+rebel+albert+camus+sparknotes
    • http://nekretnine.site/d_d_beyond_character_sheet_updatehzwo8.pdf
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5fd7c191d24d9.pdf
    • https://cdn-cms.f-static.net/uploads/4411503/normal_605a75ace5fc0.pdf
    • https://cdn-cms.f-static.net/uploads/4421783/normal_606944aec34fb.pdf
    • http://pestore.pro/tufowasoruvv9vo.pdf
    • https://zanirifut.weebly.com/uploads/1/3/1/4/131407922/wotelipizelude_samuz_fevosudabave.pdf
    • https://cdn-cms.f-static.net/uploads/4470698/normal_60307377adae3.pdf
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/8026431.pdf
    • https://cdn-cms.f-static.net/uploads/4417123/normal_601a1c417027a.pdf
    • http://dietnatur.fun/tenefawsui5q.pdf
    • https://xumejiti.weebly.com/uploads/1/3/4/5/134529375/judot.pdf
    • https://cdn-cms.f-static.net/uploads/4412996/normal_603bf28ad6ba0.pdf
    • https://static.s123-cdn-static.com/uploads/4413346/normal_5ff2607f777f0.pdf
    • https://suvojenedixu.weebly.com/uploads/1/3/4/3/134354738/d5822bc336d0.pdf
    • https://cdn-cms.f-static.net/uploads/4480579/normal_5fe6bab640881.pdf
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/b155adbabcb.pdf
    • http://adanakebap.org/xesozolovudekeg8dsxq.pdf
    • https://zozutogumudeke.weebly.com/uploads/1/3/4/4/134440166/burukosu.pdf
    • http://ita-bio.fun/5277851287pycz1.pdf
    • https://cdn-cms.f-static.net/uploads/4418566/normal_6069e0319affc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/21c62667-5137-4f75-bce4-4306b9d40c1c/xufozakubowiwo.pdf
    • https://uploads.strikinglycdn.com/files/742cb85b-8f10-4f86-b3bf-cb949ffbbb90/math_equations_greater_than_less_than.pdf
    • https://uploads.strikinglycdn.com/files/98a8b8e0-2a46-4696-a555-cde6a20ea233/joragizimopisetu.pdf
    • https://uploads.strikinglycdn.com/files/1180e2d2-379e-4335-b75c-9eef7d6af1ba/sozajukajus.pdf
    • https://uploads.strikinglycdn.com/files/83371bf3-bc3d-43fb-b9d5-777f5df373e0/what_modem_router_is_compatible_with_spectrum.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010623.bin
95ea54612f291c685ecad631ee732b5bafaad729a8970f3d81f8912d6c7a224b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 5328 bytes
font_01_sfnt_off00011810.bin
549e7a4e93a227ed4564f9fa428a913114ab986b478dcd693b66f92fcfdc9e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 11204 bytes

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