Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e846520f767839…

MALICIOUS

PDF

64.4 KB Created: 2021-02-19 00:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 2f7c83867fa93746bcc7671d589a4cc4 SHA-1: e2b1a73b85a5e19635600243d88eb19ba3e0c2fc SHA-256: 22e846520f76783921c9e1b2b107a8bbe5b28dc3f27d568d9aa74fcd36199a27
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. The document body, though heavily obfuscated, suggests a lure related to educational materials ('collections close reader grade 8 answer key'). The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to redirect users to malicious sites for phishing or malware distribution.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=collections+close+reader+grade+8+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5feb81bcbde29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_602debe75e9d7.pdfIn PDF document text
    • https://mitukuruzatag.weebly.com/uploads/1/3/5/3/135346955/rokeverifupixe_jutur_barerovovoke_memevol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370525/normal_5ffe4dd1cf57c.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/6285693.pdfIn PDF document text
    • https://vuxomikegivu.weebly.com/uploads/1/3/1/4/131453843/kesina.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/xisakazelelinim/62640940174.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/complex_indices_questions_and_answers.pdfIn PDF document text
    • http://mowowaruxuxizim.rf.gd/31111549212.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/32508137069.pdfIn PDF document text
    • http://tebalakafepikob.rf.gd/avery_5161_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/free_atkins_recipes.pdfIn PDF document text
    • http://gasigigi.rf.gd/neoliberalismo_capitalismo_informacional.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/imf_stability_report_2019.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_off0000c0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C6 5464 bytes
SHA-256: 2d45ce6a7ed7e7c4db784ed3d8e69cb1b7ed4c8592df6b6b1935a205f69417cc
font_01_sfnt_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 9744 bytes
SHA-256: a16f07f7f6102ecad11b7ba0c659fec6935a2584e318675a7c57dde36cc9c6da

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