Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ba805a89bc1ed2…

MALICIOUS

PDF

81.8 KB Created: 2021-05-16 06:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6e9037550d508c482925c5b7698c7c0 SHA-1: d1f479739da49d86a4578cfcdc172485575653cb SHA-256: 40ba805a89bc1ed2d857d5763cfe9517678a44708debdd4ceb76c371c5036fac
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, directing users to a suspicious URL. ClamAV also detected it as a phishing trojan. The embedded content, though heavily obfuscated, suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=best+books+for+teaching+yoga
    • https://cdn.sqhk.co/bagadogod/8sjhjJY/16285004314.pdf
    • https://vewiwuxipax.weebly.com/uploads/1/3/2/6/132681682/ruxatekilumokuvofe.pdf
    • https://ziduxibuzogegu.weebly.com/uploads/1/3/4/0/134012824/1fcf4d6f2e38d78.pdf
    • https://cdn.sqhk.co/gefimiwotux/Alghi3v/check_lotto_scratchers_online_texas.pdf
    • https://fizokufewof.weebly.com/uploads/1/3/4/0/134096090/2067303.pdf
    • https://nimivumunekal.weebly.com/uploads/1/3/3/9/133999229/675790.pdf
    • https://nabivuzofew.weebly.com/uploads/1/3/6/0/136050188/tijubobaziru.pdf
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/vexipegula_kuganuzekukug_govan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_2b46a06718b546e28d8f31b2e3099ad6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2b701a12-5798-4fd0-bfe4-77f6db3d5a7a/mc9090_hard_reset_process.pdf
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_ec8d5827840f4df29be561b644e9db32.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c66a67dd-1e96-4fd5-a5a9-01afd26ea176/16042167707.pdf
    • https://s3.amazonaws.com/sedowedi/how_to_complete_the_square_steps.pdf
    • https://s3.amazonaws.com/wajibile/wemafik.pdf
    • https://s3.amazonaws.com/moduluzuxikari/40276372425.pdf
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_a0a8e27092a8405fa36dba9c6240c682.pdf?index=true
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_4830ea0a7d9f4d27b2aa67cdb2c2629a.pdf?index=true
    • 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_off000101fe.bin
d4ad848d88f8654c5d73a9154f56e58e770c2c7ba06eccb59574c18b05e67702		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 5468 bytes
font_01_sfnt_off000114a3.bin
f11fa460ce6ef6b054629dd2373c4d70320d42c2cd5df386fc46ad9ad41ad748		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 11092 bytes

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