Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d0ac34a7c3c3fe…

MALICIOUS

PDF

91.3 KB Created: 2021-02-21 17:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: adf2551b1d31cd7c5ac53eb9407d3ab2 SHA-1: 4b51c6fbc9813b88676f230b32b5dd3d07282923 SHA-256: c0d0ac34a7c3c3fe1338eb045448626e79087756b260834ebda498cdc2bceb3d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The primary attack pattern involves a link farm of 30 external PDF URLs, suggesting an attempt to redirect users to potentially malicious content or engage in SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a sophisticated redirection mechanism, likely leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://druttle.ru/strik?utm_term=can+division+2+schools+give+full+athletic+scholarships PDF link annotation
    • https://raxaregos.weebly.com/uploads/1/3/4/3/134363135/2950300.pdfIn PDF document text
    • https://cdn.sqhk.co/javajadoj/Ficjdgi/modekejipotakoxerarusewa.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/mghovaR/mipadelulipowerabokize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_601c64a12d18c.pdfIn PDF document text
    • https://cdn.sqhk.co/kefesizo/0Iwjihf/74061709272.pdfIn PDF document text
    • https://cdn.sqhk.co/zexupibo/hdvgdFZ/best_app_to_download_free_music_videos.pdfIn PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/suminiguz-wibajim-morijivipazimux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_6017d42d77733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_6022db9b7041b.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/gi3QiKv/53648731256.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369903/normal_6004b5d79137a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470533/normal_5fee4cd37acf3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5fdd8aba19796.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/YHOcTgf/58870196996.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/jaUHhhb/baby_growth_spurt_ages_9_months.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/ajgmgjo/18400098958.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bivanud/gevuxuxupegedivomedir.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/how_do_you_reset_a_mini_fridge.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/63253474364.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/ziguniweboparozexawifizef.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 5512 bytes
SHA-256: 23dd8ad2f097c7e02393d7a2fa2960c2a2abe13b064044b13b2bc04ef2595dbd
font_01_sfnt_off00013a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A30 10760 bytes
SHA-256: 62447d8f6d8e9bfa11c989782f01161a61d53296d2d8091ab88910b52d2a1bf5

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