Malicious PDF — malware analysis report

Static analysis result for SHA-256 00553420c7e9fc2c…

MALICIOUS

PDF

79.0 KB Created: 2021-04-04 06:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bd80cbb3d8820d95e68767e58fda273 SHA-1: dda059e13f61db196118cdefe6b29dff4c61e177 SHA-256: 00553420c7e9fc2cb49e6c78c71c56fa8d22d6aa2ddefbbd02d16bb2defdaabc
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique commonly used in phishing campaigns to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to facilitate the download or redirection to a second-stage payload.

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://ponafet.ru/strik?utm_term=sports+illustrated+swimsuit+chrissy+teigen+2010
    • http://devgame.design/bumblebee_transformer_hasbrof50kj.pdf
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/2737779.pdf
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/sonuzosuj_notelu.pdf
    • https://cdn.sqhk.co/fuxuduxexi/dUwiPii/ikea_hours_of_operation_bloomington_mn.pdf
    • https://zefowumuf.weebly.com/uploads/1/3/5/3/135327275/xelopupojak.pdf
    • http://help-feedback-amzn8.xyz/wukunelotezomvwr7n.pdf
    • https://cdn.sqhk.co/denidugabuni/ijifjfk/wekazidujezo.pdf
    • https://dapofawebowo.weebly.com/uploads/1/3/5/3/135347186/d187ccc64.pdf
    • https://mupurifatabe.weebly.com/uploads/1/3/5/3/135313294/0c65ce83e331.pdf
    • https://cdn.sqhk.co/xovikojux/cMUhfNH/splash_lagoon_deals_groupon.pdf
    • https://wesobopaforok.weebly.com/uploads/1/3/5/3/135311180/lerifumule.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/97ec3372-d79e-42b3-95f3-f4a5a4be59a5/7016876242.pdf
    • https://uploads.strikinglycdn.com/files/885d1702-f6b9-4568-923f-bff0f2d4f5af/why_are_some_deep_sea_creatures_bioluminescence.pdf
    • https://uploads.strikinglycdn.com/files/77eae643-7632-4281-8fc8-954ddd15afcb/vegetable_indian_dishes_recipes.pdf
    • https://s3.amazonaws.com/fosagoba/budget_line_economics_questions_and_answers.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/petty_cash_ledger_template_excel.pdf
    • https://uploads.strikinglycdn.com/files/7cb9ba55-9192-44be-834e-bcd3e6ece229/17072504765.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_off0000f223.bin
68464dfb5446f03d0cc75b23f6fa44ce75de23d1277cea90c5b1d552eea79411		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 6108 bytes
font_01_sfnt_off000106da.bin
49a27835d40d6d2dc282dc31e5d49fee55d1fa9801a901dcd2987c49eb3c9950		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 11220 bytes

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