Malicious PDF — malware analysis report

Static analysis result for SHA-256 2460ec3e34d2b487…

MALICIOUS

PDF

81.4 KB Created: 2021-04-03 21:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a84a87476440579eb12021b1dcff464 SHA-1: 234787099831f7ae7e940a73ecdd41401e08a14e SHA-256: 2460ec3e34d2b487db21423b0490fbb55a4b22846d8e55df7e9f88b13b4285fe
222 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The document body, though heavily obfuscated, suggests a lure related to a 'logic puzzle game app', and the presence of a 'download button' heuristic reinforces this. The file is detected by ClamAV as Pdf.Phishing.Trojan, indicating a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=logic+puzzle+game+app+iphone
    • https://dufowazana.weebly.com/uploads/1/3/4/5/134529111/kegipuvi-peluf-jefox-japovikuvi.pdf
    • https://vikenefimedok.weebly.com/uploads/1/3/4/3/134390201/rugewotejadaf.pdf
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/tadiwupowexulowov.pdf
    • https://sovivagigeb.weebly.com/uploads/1/3/5/2/135296454/gomafalexux.pdf
    • https://xesusilinani.weebly.com/uploads/1/3/0/8/130874458/zejazun-xawujizopezilex-bazeloxupoz-nilefafonaruje.pdf
    • https://ronumotesagazuw.weebly.com/uploads/1/3/4/3/134373959/3a74b40.pdf
    • https://fejaxipanegis.weebly.com/uploads/1/3/2/7/132712099/xixam.pdf
    • https://betubuko.weebly.com/uploads/1/3/1/3/131379781/1011526.pdf
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/tafenivudek.pdf
    • http://lufafemazivug.iblogger.org/hp_elitebook_2740p_user_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_4cc9373ccc584171bd0369b7b549bfad.pdf?index=true
    • https://s3.amazonaws.com/zubuwujoxom/sinurepetixufom.pdf
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_a03033a3c46c4288ac5be8b87721f5ce.pdf?index=true
    • http://xumusemowujev.epizy.com/2350129945.pdf
    • https://42f4b946-f871-4f2a-a73e-6571c6569919.filesusr.com/ugd/e20521_2aba0bc57bb447628415f88c1895cff6.pdf?index=true
    • https://s3.amazonaws.com/rikolesafuwofar/58041083496.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f2.bin
daec204590ef76ddb071c1de2780b2dfd39e6d45b301491dd4e8b781c6df7191		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 4868 bytes
font_01_sfnt_off0001065d.bin
11e8b3bad5aa578bc034daf5f6ae7fb7ae7ae3736bcbfee15ac6a45702bec72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 10608 bytes
font_02_sfnt_off00012aa8.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 4324 bytes

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