Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a3436a66e71312…

MALICIOUS

PDF

65.3 KB Created: 2021-02-23 08:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8313373d938ebf21e6c946673bb2b1bf SHA-1: 9dffa62ea5450697c9e77ae1192c73181f096046 SHA-256: 99a3436a66e7131225816913553657b20ba0dea6d9d09b025155b8cba817dd9a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to attract traffic. The primary URL suggests a lure related to downloading music, which is a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wix?keyword=enrique+iglesias+all+songs+free+mp3+download+pagalworld PDF link annotation
    • https://kebopudej.weebly.com/uploads/1/3/5/2/135298692/8965743.pdfIn PDF document text
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/1306720.pdfIn PDF document text
    • https://pukokisawar.weebly.com/uploads/1/3/4/7/134749025/zetesenekivunupix.pdfIn PDF document text
    • https://fodoradesak.weebly.com/uploads/1/3/1/4/131454556/pemepomoke_fabefateku.pdfIn PDF document text
    • https://netevidogewe.weebly.com/uploads/1/3/4/7/134715311/bofafa-kofefevivafag.pdfIn PDF document text
    • https://jononosafopobof.weebly.com/uploads/1/3/4/6/134649788/judunuxezokujixure.pdfIn PDF document text
    • https://punelita.weebly.com/uploads/1/3/4/6/134679726/bevulanisuwebufu.pdfIn PDF document text
    • https://kunimagim.weebly.com/uploads/1/3/4/6/134608209/424eaf19e19.pdfIn PDF document text
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/nunomipugonax.pdfIn PDF document text
    • https://napujokid.weebly.com/uploads/1/3/5/3/135339673/popikimew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najudugofuk.rf.gd/cash_flow_balance_sheet_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/devexpress_mvc_report.pdfIn PDF document text
    • http://jimomug.rf.gd/35877779488.pdfIn PDF document text
    • http://nawonarubital.epizy.com/7712560231.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/fipoxovupulezok.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/472148366.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/sisirivoripopililu.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/68449084119.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_off0000c021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC021 5700 bytes
SHA-256: 431445efc3745b5053503d0ca2ae69a11ccf9552fbd58e98bc2cb21b0e6013a1
font_01_sfnt_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 10608 bytes
SHA-256: 6e304f1bb6caa9618bf0edaf475e4f90eefc578f59414d4ccf02c8b311d0b36a

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