Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc6d42f94a7275f…

MALICIOUS

PDF

74.7 KB Created: 2021-03-27 22:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fe8112f04b56902fdf71a4907775c3a SHA-1: 79fc32ff308a1546e9d898d7866b546d46db4408 SHA-256: 4dc6d42f94a7275f2a5a7f4cff3a08fcafaa2632e5a78a13987c3797ab404adb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to drive traffic to malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://vilenefex.ru/wix?keyword=canon+eos+50d+manuale+italiano
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/gekeworimu-morogurexuve.pdf
    • http://casserlabs.xyz/the_school_of_greatness_podcast_spotify2671q.pdf
    • http://ginupedarokuxu.getenjoyment.net/pdf_file_download_app_for_jio_phone.pdf
    • http://wigewanadowo.22web.org/51165271914.pdf
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/779ac2a6.pdf
    • https://vifutezovabul.weebly.com/uploads/1/3/1/4/131408528/buzarasivamina-sabodikesigutit.pdf
    • http://subfamjtii.site/90459847604fuzms.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://niwepikos.rf.gd/25624854213.pdf
    • https://s3.amazonaws.com/fixararololu/kurigegu.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/ginekorapegarajokonu.pdf
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_d1cc647cd888496ea89fdfdd9bfaa5a1.pdf?index=true
    • https://s3.amazonaws.com/gisujubolidine/razafuratak.pdf
    • http://punotonaduwize.atwebpages.com/what_to_take_after_english_101.pdf
    • https://e41bb7a9-a35b-4578-ac27-1eab720d379a.filesusr.com/ugd/8912ce_d619ff8376fe40598d638ccf7e188dd1.pdf?index=true
    • https://s3.amazonaws.com/zuses/chemistry_review_book_answer_key.pdf
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_951dc3a648694301a6d2eef722842027.pdf?index=true
    • http://sabixisadosafa.rf.gd/67725327538.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_off0000e506.bin
b457259a9e17ab74894429bc228ef57feb8fe46065a9b8007ebbd716f39ac6a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 5048 bytes
font_01_sfnt_off0000f61e.bin
ba86c401f001c72c8feefe1ef52fee192bd7103b933705ee1ef83c69995a3884
pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 11640 bytes